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
Synthesis and transformations of metallacycles 41. Cyclomagnesiation of O-containing 1,2-dienes with Grignard reagents in the presence of Cp2TiCl2
作者:V. A. D’yakonov、A. A. Makarov、E. Kh. Makarova、L. M. Khalilov、U. M. Dzhemilev
DOI:10.1007/s11172-012-0269-1
日期:2012.10
A Cp2TiCl2-catalyzed intermolecular homocyclomagnesiation of O-containing 1,2-dienes and cross-cyclomagnesiation of O-containing 1,2-dienes with aliphatic 1,2-dienes of cyclic and acyclic structure have been accomplished using Grignard reagents, which led to mono- and bicyclic organomagnesium compounds in 61–94% yields.
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
Synthesis of macrocyclic mono- and diolides based on new ω-hydroxyalkadienoic acids with (Z,Z)-1,5-diene moiety
作者:I. I. Islamov、I. V. Gaisin、U. M. Dzhemilev、V. A. D’yakonov
DOI:10.1007/s11172-024-4278-7
日期:2024.6
A stereoselective synthesis of new (6Z,10Z)-16-hydroxyhexadeca-6,10-dienoic and (7Z,11Z)-18-hydroxyoctadeca-7,11-dienoic acid that involved the Ti-catalyzed homocyclomagnesiation of the functionally substituted 1,2-dienes was developed. Subsequent intramolecular cyclization of the synthesized ω-hydroxyalkadienoic acids in the presence of catalytic amounts (2.5–10 mol.%) of hafnium(iv) triflate gave