Bithiophene with Winding Vine-shaped Molecular Asymmetry. Preparation, Structural Characterization, and Enantioselective Synthesis
作者:Yuka Toyomori、Satoru Tsuji、Shinobu Mitsuda、Yoichi Okayama、Shiomi Ashida、Atsunori Mori、Toru Kobayashi、Yuji Miyazaki、Tsuyoshi Yaita、Sachie Arae、Tamotsu Takahashi、Masamichi Ogasawara
DOI:10.1246/bcsj.20160265
日期:2016.12.15
Preparation of 2,2′-bithiophene derivatives bearing ω-alkenyl groups at the 3,3′-positions and ring-closing metathesis reactions of the obtained compound were performed. The reaction of bithiophene bearing 3-butenyl substituents 1 with 5 mol % Grubbs 1st generation catalyst underwent ring-closing metathesis (RCM) to afford the cyclized product 7 showing winding vine-shaped molecular asymmetry in up
进行了在3,3'-位带有ω-烯基的2,2'-联噻吩衍生物的制备和所得化合物的闭环复分解反应。带有 3-丁烯基取代基的联噻吩 1 与 5 mol% Grubbs 第一代催化剂的反应进行了闭环复分解 (RCM),以高达 88% 的产率提供了呈现缠绕藤状分子不对称性的环化产物 7。通过使用高达 87% ee 的手性 Schrock-Hoveyda 钼-亚烷基催化剂,也实现了对映选择性 RCM。