Mechanistic Studies on the Heck−Mizoroki Cross-Coupling Reaction of a Hindered Vinylboronate Ester as a Key Approach to Developing a Highly Stereoselective Synthesis of a C1−C7 <i>Z</i>,<i>Z</i>,<i>E</i>-Triene Synthon for Viridenomycin
作者:Andrei S. Batsanov、Jonathan P. Knowles、Andrew Whiting
DOI:10.1021/jo0626010
日期:2007.3.1
Mechanistic studies of the Heck−Mizoroki reaction of a vinylboronate ester with electronically different (four-substituted) aryl iodides shows that electron donors accelerate the cross-coupling, demonstrating that the oxidative addition step is not rate determining and that there is development of some degree of positive charge in the rate determining step. These results were used as a basis to allow
A Stereoselective Palladium-Mediated Reductive Coupling of Electron-Deficient Terminal Iodoalkenes
作者:Andrei S. Batsanov、Jonathan P. Knowles、Benedict Samsam、Andrew Whiting
DOI:10.1002/adsc.200700464
日期:2008.1.25
Iodoacrylate esters undergo palladium-catalysed reductive homocoupling to derive dienyl diester derivatives. This reductivecoupling can be extended to ester-substituted terminal iododienes to derive tetraene diesters. In all cases, the reactions show relatively high levels of stereocontrol, which shows an inversion of stereochemistry about one iodoalkene unit. This process, and the suggestion that the
Studies directed toward the synthesis of viridenomycin. Route 2: a second generation approach
作者:Alex G Waterson、Albert W Kruger、A.I Meyers
DOI:10.1016/s0040-4039(01)00701-8
日期:2001.6
A second generation approach toward the synthesis of viridenomycin is described. Three key fragments of the molecule have been synthesized in stereochemically pure form. Initial studies toward the coupling of these fragments with the aim of assembling the macrocycle are detailed. Final efforts to reach the title compound are documented. (C) 2001 Elsevier Science Ltd. All rights reserved.