New Tandem Reactions of Metal Carbenoids. Intermolecular Formation of Azomethine Ylide from Methyl 2-Diazo-2-phenylacetate and Schiff Base: Intramolecular 1,3-Dipolar Cycloaddition
作者:A. F. Khlebnikov、M. S. Novikov、A. A. Bespokoev、R. R. Kostikov、J. Kopf、Z. A. Starikova、M. Yu. Antipin
DOI:10.1007/s11178-005-0267-y
日期:2005.6
Rhodium acetate-catalyzed decomposition of methyl 2-diazo-2-phenylacetate in the presence of substituted N-methylbenzylideneamines possessing an activated alkenyl fragment (dipolarophile) in the side chain gives products of intramolecular cycloaddition of intermediate Z,E- and E,Z-azomethine ylides. The cycloaddition is regioselective, and the products are hexahydrochromeno[4,3-b]pyrrole derivatives. The stereoselectivity of the process depends on the temperature. In the temperature range from 20 to 80°C, the major stereoisomer is that with cis junction of the tetrahydropyran and pyrrolidine rings. N-Phenylazomethine ylides generated from methyl 2-diazo-2-phenylacetate and alkyl 4-[2-(phenyliminomethyl)phenoxy]-2-butenoates at 40°C undergo cyclization to aziridines at a higher rate, as compared to the rate of cycloaddition to the internal dipolarophile. N-Phenylazomethine ylides generated by thermolysis of the corresponding aziridine or by the “deprotonation” method react with equal regio- and stereoselectivity to give intramolecular cycloaddition products, hexahydrochromeno[4,3-b]pyrrole derivatives with trans-fused tetrahydropyran and pyrrolidine rings. Analysis of the experimental and calculation data suggests preference of the endo transition state in the cycloaddition of the examined azomethine ylides.
在侧链中具有活化烯基片段(亲偶极试剂)的取代的 N-甲基亚苄基胺存在下,醋酸铑催化 2-重氮-2-苯基乙酸甲酯分解,得到中间体 Z,E- 和 E,Z- 的分子内环加成产物偶氮甲碱叶立德。环加成反应具有区域选择性,产物为六氢苯并[4,3-b]吡咯衍生物。该过程的立体选择性取决于温度。在20~80℃的温度范围内,主要的立体异构体是四氢吡喃环和吡咯烷环顺式连接的立体异构体。与环加成速率相比,由 2-重氮-2-苯基乙酸甲酯和 4-[2-(苯基亚氨基甲基)苯氧基]-2-丁烯酸烷基酯在 40°C 生成的 N-苯基甲亚碱叶立德以更高的速率环化为氮丙啶到内部亲偶极子。通过热解相应的氮丙啶或通过“去质子化”方法产生的N-苯基甲亚碱叶立德以相同的区域选择性和立体选择性反应,得到分子内环加成产物,即具有反式稠合四氢吡喃和吡咯烷环的六氢苯并[4,3-b]吡咯衍生物。对实验和计算数据的分析表明,在所检测的偶氮甲碱叶立德的环加成中优选内过渡态。