合成路线:The benzoylation of 2-methylthiopyrrole (I) with N,N-dimethylbenzamide (II) by means of POCl3 in refluxing CH2Cl2 gives 5-benzoyl-2-methylthiopyrrole (III),which is condensed with spiro[2.5]-5,7-dioxa-6,6-dimethyloctane-4,8-dione (IV) by means of NaH in DMF yielding compound (V).The oxidation of (V) with m-chloroperbenzoic acid in CH2Cl2 affords the sulfone (VI),which is submitted to methanolysis with methanol and HCl giving 1-(3,3-dimethoxycarbonylpropyl)-2-methanesulfonyl-5-benzoylpyrrole (VII).The cyclization of (VII) with NaH in DMF yields dimethyl 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1,1-dicarboxylate (VIII),which is finally hydrolyzed and decarboxylated with KOH in refluxing methanol.Compound (III) can be oxidized with m-chloroperbenzoic acid as before giving 2-methanesulfonyl-5-benzoylpyrrole (IX),which is then condensed with spiro compound (IV) as before to afford compound (VI),already obtained.
合成路线:The condensation of dimethylacetone-1,3-dicarboxylate (X) with ethanolamine (XI) yields methyl 3-(methoxycarbonylmethyl)-3-(2-hydroxyethylamino)acrylate (XII),which is cyclized with bromoacetaldehyde diethylacetal (XIII) affording methyl 1-(2-hydroxyethyl)-3-methoxycarbonylpyrrol-2-acetate (XIV).Acylation of (XIV) with methanesulfonyl chloride (XV) and triethylamine in CH2Cl2 yields the corresponding mesylate (XVI),which by treatment with methyl iodide in refluxing acetonitrile is converted into methyl 1-(2-iodoethyl)-3-methoxycarbonylpyrrole-2-acetate (XVII).The cyclization of (XVII) with NaH in DMF yields dimethyl 1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1,7-dicarboxylate (XVIII),which is hydrolyzed with KOH in refluxing methanol - water to the corresponding diacid (XIX).Partial esterification of (XIX) with isopropanol and HCl gives isopropyl 1,2-dihydro-3H-7-carboxypyrrolo[1,2-a]pyrrole-1-carboxylate (XX),which is decarboxylated by heating at 270 C affording isopropyl 1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate (XXI).Benzoylation of (XXI) with N,N-dimethylbenzamide (XXII) and POCl3 in refluxing CH2Cl2 yields isopropyl 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate (XXIII),which is finally hydrolyzed with K2CO3 or NaOH in methanol - water.
参考文献标题:RS-37,619
文献作者:Arrigoni-Martelli,E.; Castar,J.; Blancafort,P.; Serradell,M.N.
参考来源:Drugs Fut 1983,8(10),871
合成路线:The condensation of dimethylacetone-1,3-dicarboxylate (X) with ethanolamine (XI) yields methyl 3-(methoxycarbonylmethyl)-3-(2-hydroxyethylamino)acrylate (XII),which is cyclized with bromoacetaldehyde diethylacetal (XIII) affording methyl 1-(2-hydroxyethyl)-3-methoxycarbonylpyrrol-2-acetate (XIV).Acylation of (XIV) with methanesulfonyl chloride (XV) and triethylamine in CH2Cl2 yields the corresponding mesylate (XVI),which by treatment with methyl iodide in refluxing acetonitrile is converted into methyl 1-(2-iodoethyl)-3-methoxycarbonylpyrrole-2-acetate (XVII).The cyclization of (XVII) with NaH in DMF yields dimethyl 1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1,7-dicarboxylate (XVIII),which is hydrolyzed with KOH in refluxing methanol - water to the corresponding diacid (XIX).Partial esterification of (XIX) with isopropanol and HCl gives isopropyl 1,2-dihydro-3H-7-carboxypyrrolo[1,2-a]pyrrole-1-carboxylate (XX),which is decarboxylated by heating at 270 C affording isopropyl 1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate (XXI).Benzoylation of (XXI) with N,N-dimethylbenzamide (XXII) and POCl3 in refluxing CH2Cl2 yields isopropyl 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylate (XXIII),which is finally hydrolyzed with K2CO3 or NaOH in methanol - water.
参考文献标题:BPPC
文献作者:Blancafort,P.; Serradell,M.N.; Hillier,K.; Castar,J.
参考来源:Drugs Fut 1981,6(11),669
合成路线:The benzoylation of 2-methylthiopyrrole (I) with N,N-dimethylbenzamide (II) by means of POCl3 in refluxing CH2Cl2 gives 5-benzoyl-2-methylthiopyrrole (III),which is condensed with spiro[2.5]-5,7-dioxa-6,6-dimethyloctane-4,8-dione (IV) by means of NaH in DMF yielding compound (V).The oxidation of (V) with m-chloroperbenzoic acid in CH2Cl2 affords the sulfone (VI),which is submitted to methanolysis with methanol and HCl giving 1-(3,3-dimethoxycarbonylpropyl)-2-methanesulfonyl-5-benzoylpyrrole (VII).The cyclization of (VII) with NaH in DMF yields dimethyl 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1,1-dicarboxylate (VIII),which is finally hydrolyzed and decarboxylated with KOH in refluxing methanol.Compound (III) can be oxidized with m-chloroperbenzoic acid as before giving 2-methanesulfonyl-5-benzoylpyrrole (IX),which is then condensed with spiro compound (IV) as before to afford compound (VI),already obtained.
参考文献标题:Novel syntheses of 5-aryl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acids
文献作者:Muchowski,J.M.; Franco,F.; Greenhouse,R.
参考来源:J Org Chem 1982,47(9),1682-88
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