Can relief of ring-strain in a cyclopropylmethyllithium drive the Brook rearrangement?
作者:Jonathan Clayden、David W. Watson、Mark Chambers
DOI:10.1016/j.tet.2004.10.099
日期:2005.3
2]-Brook rearrangement led to α-silyloxy organolithiums which on warming underwent cyclopropane ringopening and [1,5]-retro-Brook rearrangement to yield γ-silyl ketones. Despite the favourability of the cyclopropane ringopening, the Brookrearrangement still required the presence of an anion stabilising group to proceed. β-Silylketones were similarly formed by Brook–retro-Brook rearrangement on warming
The asymmetrichydrogenation of silylimines was first developed by using a palladium complex of a P-stereogenic diphosphine ligand as the catalyst, affording the valuable chiral α-aminosilanes with quantitative conversions and excellent enantioselectivities (up to 99% ee).