پيرول

(تم التحويل من بيرول)
Pyrrole
Explicit structural formula of pyrrole, with aromaticity indicated by dashed bonds
Numbered skeletal formula of pyrrole
Ball-and-stick model of the pyrrole molecule
Space-filling model of the pyrrole molecule
الأسماء
اسم أيوپاك المفضل
1H-Pyrrole
أسماء أخرى
  • Azole
  • Imidole[1]
المُعرِّفات
رقم CAS
3D model (JSmol)
مرجع بايلستاين 1159
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.003.387 Edit this at Wikidata
رقم EC
  • 203-724-7
مرجع Gmelin 1705
رقم RTECS
  • UX9275000
UNII
UN number 1992, 1993
الخصائص
الصيغة الجزيئية C4H5N
كتلة مولية 67.09 g mol-1
الكثافة 0.967 g cm−3
نقطة الانصهار
نقطة الغليان
ضغط البخار 7 mmHg at 23 °س
الحموضة (pKa) 16.5 (لپروتون N-H)
القاعدية (pKb) 13.6 (pKa 0.4 لحمض مترافق)
القابلية المغناطيسية -47.6·10−6 cm3/mol
اللزوجة 0.001225 Pa s
الكيمياء الحرارية
الإنتالپية المعيارية
للتشكل ΔfHo298 		108.2 kJ mol−1 (gas)
الانتالبية المعيارية
للاحتراق ΔcHo298 		2242 kJ mol−1
سعة الحرارة النوعية، C 1.903 J K−1 mol−1
المخاطر
صفحة بيانات السلامة Chemical Safety Data
NFPA 704 (معيـَّن النار)
Flammability code 2: لابد أن يكون ساخناً باعتدال أو معرضاً لدرجة حرارة محيطة مرتفعة نسبياً قبل أن يحدث اشتعال. نقطة الوميض بين 38 و 93 °س (100 و 200 °ف). مثل وقود الديزلHealth code 2: التعرض الشديد أو المتواصل ولكن ليس بمزمن قد يتسبب في عجز مؤقت أو جرح بُحتمل بقاؤه. مثل الكلوروفورمReactivity code 0: مستقر في العادة، حتى تحت ظروف التعرض للنار، ولا يتفاعل مع الماء. مثل النيتروجين السائلSpecial hazards (white): no codeNFPA 704 four-colored diamond
2
2
0
نقطة الوميض 33.33 °C (91.99 °F; 306.48 K)
550 °C (1,022 °F; 823 K)
حدود الانفجار 3.1–14.8%
مركبات ذا علاقة
مركـّبات ذات علاقة
 Phosphole, arsole, bismole, stibole
ما لم يُذكر غير ذلك، البيانات المعطاة للمواد في حالاتهم العيارية (عند 25 °س [77 °ف]، 100 kPa).
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مراجع الجدول

پيرول Pyrrole هو مركب عضوي أروماتي حلقي غير متجانس، وهي حلقة خماسية الأعضاء بصيغة C4H4NH.[2] وهو سائل متطاير عديم اللون يقتم بمجرد تعرضه للهواء. المشتقات المُعوَّضة تُسمى، أيضاً، پيرولات، مثل N-methylpyrrole, C4H4NCH3. پورفوباي‌لينوجن Porphobilinogen، الپيرول المُعوَّض ثلاثياً، هو سابق مُخـَلـَّق حيوياً للعديد من المنتجات الطبيعية مثل الهيم.[3]

الپيرولات هي مكونات لحلقات كبرى أكثر تعقيداً، تضم پورفيرينوجنات porphyrinogen ومنتجات مشتقة منهم، مثل پورفيرينات الهيم، والكلورينات chlorin، والكلورين الجرثومي bacteriochlorins، و الكلوروفيلات.[4]

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الخصائص

الپيرول هو سائل متطاير عديم اللون يتحول إلى لون قاتم بمجرد تعرضه للهواء، وعادةً ما يـُنقـَّى بالتقطير مباشرة بعد الاستخدام.[5] الپيرول له رائحة المكسرات. وهو 5-membered aromatic heterocycle, like الـفوران furan و ثيوفين thiophene. ويختلف عن فوران وثيوفين في أن له ثنائية قطبية يقع فيها القطب الموجب بجانب ذرة غير متجانسة، بعزم ثنائي القطب قدره 1.58 د. في CDCl3، فإن لها انزياحات كيميائية عند 6.68 (H2, H5) و 6.22 (H3, H4). الپيرول حامضي بضَعف، مع حمض مترافق pKa بقيمة −3.8. أكثر كاتيونان الپيروليوم استقرارً من حيث التحريك الحراري (C4H6N+) يتشكل بإضافة پروتون عند الموقع 2. تعويض الپيرول بمعوضات ألكيلية يعطي جزيئاً أكثر قاعدية — فعلى سبيل المثال، tetramethylpyrrole له حمض مرافق pKa قدره +3.7. كما أن الپيرول حامضي بضَعف عند موقع N–H، بقيمة pKa قدرها 17.5.


التاريخ

تم التعرف على الپيرول لأول مرة من قِبل فريدليب فرديناند رونگه في 1834، كمكون لـقطران الفحم.[6] In 1857, it was isolated from the pyrolysate of bone. Its name comes from the Greek pyrrhos (πυρρός, “reddish, fiery”), from the reaction used to detect it—the red color that it imparts to wood when moistened with حمض الهيدروكلوريك.[7]

التواجد في الطبيعة

Heme b

Pyrrole itself is not naturally occurring, but many of its derivatives are found in a variety of cofactors and natural products. Common naturally produced molecules containing pyrroles include vitamin B12, bile pigments like bilirubin and biliverdin, and the porphyrins of heme, chlorophyll, chlorins, bacteriochlorins, and porphyrinogens.[4] Other pyrrole-containing secondary metabolites include PQQ, makaluvamine M, ryanodine, rhazinilam, lamellarin, prodigiosin, myrmicarin, and sceptrin. The syntheses of pyrrole-containing haemin, synthesized by Hans Fischer was recognized by the Nobel Prize.

Pyrrole is a constituent of tobacco smoke and may contribute to its toxic effects.[8]

التخليق

Pyrrole is prepared industrially by treatment of furan with ammonia in the presence of solid acid catalysts, like SiO2 and Al2O3.[7]

Synthesis of pyrrole from furan

Pyrrole can also be formed by catalytic dehydrogenation of pyrrolidine.

السبل المعملية

Several syntheses of the pyrrole ring have been described.[9]

تخليق پيرول هانتش

المقالة الرئيسية: تخليق پيرول هانتش

تخليق پيرول هانتش هو تفاعل β-ketoesters (1) مع الأمونيا (أو أمينات رئيسية) و α-haloketones ‏(2) لإعطاء پيرولات معوَّضة (3).[10][11]

تخليق پيرول هانتش

تخليق پيرول كنور

المقالة الرئيسية: تخليق پيرول كنور

The Knorr pyrrole synthesis involves the reaction of an α-amino ketone or an α-amino-β-ketoester with an activated methylene compound.[12][13][14] The method involves the reaction of an α-aminoketone (1) and a compound containing a methylene group α to (bonded to the next carbon to) a carbonyl group (2).[15]

The Knorr pyrrole synthesis

تخليق پيرول پال-كنور

المقالة الرئيسية: تخليق پيرول پال-كنور

In the Paal–Knorr pyrrole synthesis, a 1,4-dicarbonyl compound reacts with ammonia or a primary amine to form a substituted pyrrole.[16][17]

The Paal–Knorr pyrrole synthesis

تفاعل ڤان لويزن

المقالة الرئيسية: تفاعل ڤان لويزن

The Van Leusen reaction can be used to form pyrroles, by reaction of tosylmethyl isocyanide (TosMIC) with an enone in the presence of base, in a Michael addition. A 5-endo cyclization then forms the 5-membered ring, which reacts to eliminate the tosyl group. The last step is tautomerization to the pyrrole.[بحاجة لمصدر]

Mechanism of the Van Leusen reaction to form pyrroles

تخليق بارتون-زارد

المقالة الرئيسية: تخليق بارتون-زارد

The Barton–Zard synthesis proceeds in a manner similar to the Van Leusen synthesis. An isocyanoacetate reacts with a nitroalkene in a 1,4-addition, followed by 5-endo-dig cyclization, elimination of the nitro group, and tautomerization.[18]

Barton-Zard reaction.svg

تخليق پيرول پيلوتي-روبنسون

مواد البداية في تخليق پيرول پيلوتي-روبنسون، المسماة على اسمي گرترود وروبرت روبنسون وأوسكار پيلوتي، هي مكافئان للألدهايد والهيدرازين.[19][20] الناتج هو پيرول بمعوضين عند الموقعين 3 و 4. The aldehyde reacts with the diamine to an intermediate di-imine (R–C=N−N=C–R). In the second step, a [3,3]-sigmatropic rearrangement takes place between. Addition of hydrochloric acid leads to ring closure and loss of ammonia to form the pyrrole. The mechanism was developed by the Robinsons.

In one modification, propionaldehyde is treated first with hydrazine and then with benzoyl chloride at high temperatures and assisted by microwave irradiation:[21]

Piloty–Robinson reaction[21]


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السبل المبنية على الإضافة الحلقية

Pyrroles bearing multiple substituents are obtained from the reaction of münchnones and alkynes. The reaction mechanism involves 1,3-dipolar cycloaddition followed by loss of carbon dioxide by a retro-Diels–Alder process. Similar reactions can be performed using azalactones.

Synthesis of pyrroles via Diels–Alder cyclization

Pyrroles can be prepared by silver-catalyzed cyclization of alkynes with isonitriles, where R2 is an electron-withdrawing group, and R1 is an alkane, aryl group, or ester. Examples of disubstituted alkynes have also been seen to form the desired pyrrole in considerable yield. The reaction is proposed to proceed via a silver acetylide intermediate. This method is analogous to the azide–alkyne click chemistry used to form azoles.

تخليق پيرول عبر كيمياء نقرة الفضة.

وسائل أخرى

One synthetic route to pyrrole involves the decarboxylation of ammonium mucate, the ammonium salt of mucic acid. The salt is typically heated in a distillation setup with glycerol as a solvent.[22]

Synthesis of pyrrole from ammonium mucate

التخليق الحيوي للپيرولات

The de novo biosynthesis of pyrrole rings begins with aminolevulinic acid (ALA), which is synthesized from glycine and succinyl-CoA. ALA dehydratase catalyzes the condensation of two ALA molecules via a Knorr-type ring synthesis to form porphobilinogen (PBG). This later reacts to form, for example, the macrocycles heme and chlorophyll.[23]

Mechanism of biosynthesis of porphobilinogen

.

Proline is biosynthetically derived from the amino acid L-glutamate. Glutamate-5-semialdehyde is first formed by glutamate 5-kinase (ATP-dependent) and glutamate-5-semialdehyde dehydrogenase (which requires NADH or NADPH). This can then either spontaneously cyclize to form 1-pyrroline-5-carboxylic acid, which is reduced to proline by pyrroline-5-carboxylate reductase (using NADH or NADPH), or turned into ornithine by ornithine aminotransferase, followed by cyclisation by ornithine cyclodeaminase to form proline.[24]

Zwitterionic structure of both proline enantiomers: (S)-proline (left) and (R)-proline

Proline can be used as precursor of aromatic pyrroles in secondary natural products, as in prodigiosins.

Figure 1: Structure of Prodigiosin 1 highlighting the A, B, and C pyrrole rings

The biosynthesis of Prodigiosin[25] [26] involves the convergent coupling of three pyrrole type rings (labeled A, B, and C in figure 1) from L-proline, L-Serine, L-methionine, pyruvate, and 2-octenal.

Ring A is synthesized from L-proline through the nonribosomal peptide synthase (NRPS) pathway (figure 2), wherein the pyrrolidine ring of proline is oxidized twice through FAD+ to yield pyrrole ring A.

Figure 2: biosynthesis of pyrrole ring A

Ring A is then expanded via the polyketide synthase pathway to incorporate L-serine into ring B (figure 3). Ring A fragment is transferred from the peptidyl carrier protein (PCP) to the Acyl Carrier Protein (ACP) by a KS domain, followed by transfer to malonyl-ACP via decarboxylative Claisen condensation. This fragment is then able to react with the masked carbanion formed from the PLP mediated decarboxylation of L-Serine, which cyclizes in a dehydration reaction to yield the second pyrrole ring. This intermediate is then modified by methylation (which incorporates a methyl group from L-methionine onto the alcohol at the 6 position) and oxidation of the primary alcohol to the aldehyde to yield the core A-B ring structures.

Biosynthesis of pyrrole ring B

التفاعلات وردود الأفعال

Due to its aromatic character, pyrrole is difficult to hydrogenate, does not easily react as a diene in Diels–Alder reactions, and does not undergo usual olefin reactions. Its reactivity is similar to that of benzene and aniline, in that it is easy to alkylate and acylate. Under acidic conditions, pyrroles polymerize easily, and thus many electrophilic reagents that are used in benzene chemistry are not applicable to pyrroles. In contrast, substituted pyrroles (including protected pyrroles) have been used in a broad range of transformations.[9]

تفاعل الپيرول مع محبي الإلكترونات

Pyrroles generally react with electrophiles at the α position (C2 or C5), due to the highest degree of stability of the protonated intermediate.

Pyrrole electrophilic substitution

Pyrroles react easily with nitrating (e.g. HNO3/Ac2O), sulfonating (Py·SO3), and halogenating (e.g. NCS, NBS, Br2, SO2Cl2, and KI/H2O2) agents. Halogenation generally provides polyhalogenated pyrroles, but monohalogenation can be performed. As is typical for electrophilic additions to pyrroles, halogenation generally occurs at the 2-position, but can also occur at the 3-position by silation of the nitrogen. This is a useful method for further functionalization of the generally less reactive 3-position.[بحاجة لمصدر]

أسيـَلة

أسيـَلة Acylation تحدث عموماً عند the 2-position, through the use of various methods. Acylation with acid anhydrides and acid chlorides can occur without a catalyst; alternatively, a Lewis acid may be used. 2-Acylpyrroles are also obtained from reaction with nitriles, by the Houben–Hoesch reaction. Pyrrole aldehydes can be formed by a تفاعل فيلزماير-هاك. N-Acylation of simple pyrrole does not occur.

فورميلة فيلزماير-هاك للپيرول

ألكلة

الألكلة المحبة للإلكترونات للپيرول البسيط هي غير شائعة. الألكلة Alkylation لتشكيل إنونات enones عند C2 قد شوهدت.

تفاعل الپيرول منزوع الپروتون

The NH proton in pyrroles is moderately acidic with a pKa of 16.5. Pyrrole can be deprotonated with strong bases such as butyllithium and sodium hydride. The resulting alkali pyrrolide is nucleophilic. Treating this conjugate base with an electrophile such as iodomethane gives N-methylpyrrole. N-Metalated pyrrole can react with electrophiles at the N or C positions, depending on the coordinating metal. More ionic nitrogen–metal bonds (such as with Li, Na, and K) and more solvating solvents lead to N-alkylation. Nitrophilic metals, such as MgX, lead to alkylation at C (mainly C2), due to a higher degree of coordination to the nitrogen atom. In the cases of N-substituted pyrroles, metalation of the carbons is more facile. Alkyl groups can be introduced as electrophiles, or by cross-coupling reactions.[بحاجة لمصدر]

Pyrrole C-metalation

Substitution at C3 can be achieved through the use of N-substituted 3-bromopyrrole, which can be synthesized by bromination of N-silylpyrrole with NBS.[بحاجة لمصدر]


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الاختزالات

Pyrroles can undergo reductions to pyrrolidines and to pyrrolines. For example, Birch reduction of pyrrole esters and amides produced pyrrolines, with the regioselectivity depending on the position of the electron-withdrawing group.[بحاجة لمصدر]

Cyclization reactions

Pyrroles with N-substitution can undergo cycloaddition reactions such as [4+2]-, [2+2]-, and [2+1]-cyclizations. Diels-Alder cyclizations can occur with the pyrrole acting as a diene, especially in the presence of an electron-withdrawing group on the nitrogen. Vinylpyrroles can also act as dienes.[بحاجة لمصدر]

Pyrrole DA

Pyrroles can react with carbenes, such as dichlorocarbene, in a [2+1]-cycloaddition. With dichlorocarbene, a dichlorocyclopropane intermediate is formed, which breaks down to form 3-chloropyridine (the Ciamician–Dennstedt rearrangement).[27][28][29]

Ciamician–Dennstedt rearrangement

الاستخدامات التجارية

Pyrrole is a precursor to the drug tolmetin. Polypyrrole is of some commercial value. N-Methylpyrrole is a precursor to N-methylpyrrolecarboxylic acid, a building-block in pharmaceutical chemistry.[7] Pyrroles are also found in several drugs, including atorvastatin, ketorolac, and sunitinib. Pyrroles are used as lightfast red, scarlet, and carmine pigments.[30][31]

المضاهيات والمشتقات

Structural analogs of pyrrole include:

  • Pyrroline, a partially saturated analog with one double bond
  • Pyrrolidine, the saturated hydrogenated analog

Derivatives of pyrrole include indole, a derivative with a fused benzene ring.

انظر أيضاً

المراجع

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  24. ^ قالب:Lehninger3rd.
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للاستزادة

  • Jones, R. Jones, ed. (1990). Pyrroles. Part I. The Synthesis and the Physical and Chemical Aspects of the Pyrrole Ring. The Chemistry of Heterocyclic Compounds. Vol. 48. Chichester: John Wiley & Sons. p. 351. doi:10.1002/recl.19911100712. ISBN 978-0-471-62753-1. {{cite book}}: |journal= ignored (help)
  • Jolicoeur, Benoit; Chapman, Erin E.; Thompson, Alison; Lubell, William D. (2006). "Pyrrole protection". Tetrahedron. 62 (50): 11531–11563. doi:10.1016/j.tet.2006.08.071.

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