Stereoselective migration of sterically hindered organoboranes in cyclic and acyclic systems. A stereoselective allylic C–H activation reaction
作者:Eike Hupe、Dmitri Denisenko、Paul Knochel
DOI:10.1016/j.tet.2003.09.043
日期:2003.11
The thermal migration of cyclic and acyclic organoboranes were studied. In most cases, a stereoselective 1,2-dyotropic migration was observed, allowing the stereocontrol of three contiguous chiral centers. Scope and limitations of this thermal migration are presented.
Highly Regio- and Stereoselective Thermal Migration of Organoboranes in Acyclic Molecules
作者:Lars O. Bromm、Hamid Laaziri、Frédéric Lhermitte、Klaus Harms、Paul Knochel
DOI:10.1021/ja001283y
日期:2000.10.1
Synthesis of isomeric benchrotrenic alkenes by Ti-induced carbonyl coupling reaction
作者:J. Besançon、J. Szymoniak、C. Moïse
DOI:10.1016/0022-328x(92)83065-p
日期:1992.3
The benchrotrenic ketones BctCOR (1) (Bct: Cr(CO)3C6H5; R = CH3 (a), C2H5 (b), n-C3H7 (c), n-C4H9 (d)) undergo reductive alkene coupling reaction when treated with TiCl3/Li. The two isomeric forms of Bct(R)C=C(R)Bct (2) were isolated in the ratio Z/E = ca. 3:1. Decomplexation of 2 by iodine gave quantitatively the corresponding isomeric alkyl stilbenes C6H5(R)C=C(R)C6H5 (3).