通过Wittig烯化反应合成了3,6,8-十二碳三烯-1-醇1的八个几何异构体,即地下白蚁的尾随信息素(sp。Banks )。1的收敛合成由两个片段的组合组成,每个片段包含一个具有固定构型的烯烃,这是通过形成第三个双键给出的两种几何异构体的混合物。1的混合物通过循环高效液相色谱法分离。单个异构体的1 H和13 C NMR峰分配通过同核COSY和一键CH相关光谱法完成。
Cascade radical cyclisations with vinylcyclopropane electrophores
作者:Gerald Pattenden、Paul Wiedenau
DOI:10.1016/s0040-4039(97)00691-6
日期:1997.5
tris-(trimethylsilyl)silane (TTMSS)-AIBN gave 6 and 7 (2:1, 65%) resulting from a radical cascade 13-endo macrocyclisation followed by successive transannularcyclisations. In a similar manner, the iodo vinylcyclopropane 12a underwent triple cyclisation to a mixture of diastereoisomers of the oestrone analogue 14 (∼ 16%), but the vinylcyclopropyl ester 9a gave only the product 11 of macrocyclisation
Substrate-Directed Enantioselective Aziridination of Alkenyl Alcohols Controlled by a Chiral Cation
作者:Alexander Fanourakis、Nicholas J. Hodson、Arthur R. Lit、Robert J. Phipps
DOI:10.1021/jacs.3c00693
日期:——
Alkeneaziridination is a highly versatile transformation for the construction of chiral nitrogen-containing compounds. Inspired by the success of analogous substrate-directed epoxidations, we report an enantioselective aziridination of alkenyl alcohols, which enables asymmetric nitrene transfer to alkenes with varied substitution patterns, including those not covered by the current protocols. We believe