Novel organomagnesium reagents in synthesis. Catalytic cyclomagnesiation of allenes in the synthesis of N-, O-, and Si-substituted 1Z,5Z-dienes
作者:Vladimir A. D'yakonov、Aleksey A. Makarov、Elina Kh. Makarova、Usein M. Dzhemilev
DOI:10.1016/j.tet.2013.06.106
日期:2013.9
An efficient method for the synthesis of valuable N-, O-, and Si-containing 1Z,5Z-diene compounds was developed. The method comprises Cp2TiCl2-catalyzed homo- and cross-cyclomagnesiation of 1,2-dienes by Grignard reagents (RMgR′) to give 2,5-dialkylidenemagnesacyclopentanes in up to 96% yield. This approach was successfully used in the synthesis of 5Z,9Z-dienoic acids, precursors of acetogenins and
开发了一种有效的合成有价值的含N-,O-和Si的1 Z,5 Z-二烯化合物的方法。该方法包括通过格氏试剂(RMgR')的Cp 2 TiCl 2催化的1,2-二烯的同环和交叉环化,以高达96%的收率得到2,5-二亚烷基亚磁环环戊烷。该方法已成功用于5 Z,9 Z-二烯酸,产乙酸原素和昆虫信息素的合成。