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
The facile synthesis of the 5Z,9Z-dienoic acids and their topoisomerase I inhibitory activity
作者:Vladimir A. D'yakonov、Aleksey A. Makarov、Lilya U. Dzhemileva、Elina Kh. Makarova、Elza K. Khusnutdinova、Usein M. Dzhemilev
DOI:10.1039/c3cc44926b
日期:——
original, effective approach to the synthesis of natural and synthetic 5Z,9Z-dienoic acids in high yields (61-67%) and with high selectivity (>98%) was developed. The approach is based on the use of the new intermolecular catalytic cross cyclomagnesiation of terminal aliphatic and oxygenated 1,2-dienes upon treatment with Grignardreagents in the presence of the Cp2TiCl2 catalyst. High activity of (5Z