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 ring opening and [1,5]-retro-Brook rearrangement to yield γ-silyl ketones. Despite the favourability of the cyclopropane ring opening, the Brook rearrangement still required the presence of an anion stabilising group to proceed. β-Silylketones were similarly formed by Brook–retro-Brook rearrangement on warming
α-环丙基-α-三烷基甲硅烷基醇盐通过将环丙基锂加至酰基硅烷中或将有机锂加至环丙基甲酰基硅烷中而形成。[1,2]-布鲁克重排导致α-甲硅烷氧基有机锂,在加热时会发生环丙烷开环反应,[1,5]-复古布鲁克重排产生γ-甲硅烷基酮。尽管环丙烷开环是有利的,但布鲁克重排仍需要阴离子稳定基团的存在才能进行。β-甲硅酮是通过在温暖的带有硅酸锂的酰基硅烷上进行Brook-retro-Brook重排而形成的。