Mechanism and applications of lithium amide-induced asymmetric rearrangements of 4-substituted and 4,4-disubstituted cyclopentene oxides to cyclopentenols
作者:David M. Hodgson、Andrew R. Gibbs、Michael G. B. Drew
DOI:10.1039/a907522d
日期:——
The preparation and lithium amide-induced rearrangements of 1,2-dideuterated 4-substituted cyclopentene oxides 11 and 19 are described, providing insight into the deprotonation mechanisms operating in such systems. Highly enantioselective syntheses of 4-substituted cis-4-hydroxymethylcyclopent-2-en-1-ols 32a–c are described. Also described are asymmetric syntheses of prostaglandin precursor 40 and (+)-iridomyrmecin (48) via highly enantioselective rearrangement of the epoxide 3 and subsequent Ireland–Claisen rearrangement.
介绍了 1,2-二氚代 4-取代环戊烯氧化物 11 和 19 的制备和锂酰胺诱导的重排,为了解此类体系中的去质子化机制提供了见解。介绍了 4-取代顺式-4-羟甲基环戊-2-烯-1-醇 32a-c 的高对映选择性合成。还介绍了通过环氧化物 3 的高对映选择性重排和随后的爱尔兰-克莱森重排,不对称合成前列腺素前体 40 和 (+)-iridomyrmecin (48)。