Vinylborane and vinylchalcogenide mediated synthesis of tri- and tetrasubstituted olefins from 1-alkynes
摘要:
The title olefins have been prepared with high regio- and stereocontrol from I-alkynes through vinyl boranes / vinyl chalcogenides; the reaction sequences involved protonolysis or transmetallation - alkylation of the boranes followed by an Ni(0) catalyzed coupling reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.
Transformation of β-chalcogeno alkenylboranes into tetrasubstituted olefins
作者:Julien Gerard、László Hevesi
DOI:10.1016/j.tet.2003.11.023
日期:2004.1
In view of generating trisubstituted vinylic chalcogen derivatives, β-chalcogeno alkenylboranes generated through the chalcogen electrophile induced rearrangements of 1-alkynyltrialkyl borates have been subjected to Suzuki–Miyaura coupling and to boron to copper transmetalation followed by alkylation. Some of the trisubstituted vinyl sulfides obtained by this latter strategy have been converted efficiently
Chalcogen electrophile induced rearrangement of 1-alkynyltrialkyl borates: controlled syntheses of trisubstituted olefins from 1-alkynes
作者:Julien Gerard、László Hevesi
DOI:10.1016/s0040-4020(01)00904-8
日期:2001.10
The reaction of 1-alkynyltrialkyl borates with sulfenyl, selenenyl and tellurenyl halides produces β-chalcogeno alkenylboranes in good yields, with a cis relationship between the boron and the chalcogen moities. Protodeborylation of these compounds by acetic acid, or by a transmetalation–protonolysis sequence, leads to vinyl chalcogenides, which can be converted to alkenes by means of a nickel catalyzed
Vinylborane and vinylchalcogenide mediated synthesis of tri- and tetrasubstituted olefins from 1-alkynes
作者:Julien Gerard、Emerance Bietlot、Làszlò Hevesi
DOI:10.1016/s0040-4039(98)01938-8
日期:1998.11
The title olefins have been prepared with high regio- and stereocontrol from I-alkynes through vinyl boranes / vinyl chalcogenides; the reaction sequences involved protonolysis or transmetallation - alkylation of the boranes followed by an Ni(0) catalyzed coupling reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.