Total Synthesis of Dumsin. 1. Retrosynthetic Strategy and the Elaboration of Key Intermediates from (−)-Bornyl Acetate
作者:Leo A. Paquette、Fang-Tsao Hong
DOI:10.1021/jo0301346
日期:2003.9.1
An intramolecular anionic oxy-Cope rearrangement (44 --> 46) serves as the key step in a synthetic approach to the insect antifeedant dumsin. Initial investigations clarified the manner in which (--)-bornyl acetate may be transformed into the exo-norbornenol 44. Two routes were developed to advance beyond 46. The first involved acetal 51 as a matrix that was expected to allow the elaboration of rings
分子内阴离子oxy-Cope重排(44-> 46)是昆虫抗饲料dumsin合成方法中的关键步骤。初步研究阐明了乙酸(-)乙酸冰片酯可转化为外降冰片烯醇44的方式。开发了两种方法以超越46。首先涉及乙缩醛51作为基质,预期可精制环D和E。第二个计划将46中的环戊烯环的氧化反应推迟到分子构建的后期。后面的实验构成了协议的基础,该协议导致成功获取以108和114为代表的酮醛。