Cyclohexenol annulation via the alkoxy-accelerated rearrangement of vinylcyclobutanes
作者:Rick L. Danheiser、Carlos Martinez-Davila、Howard Sard
DOI:10.1016/s0040-4020(01)93268-5
日期:——
efficient method for the synthesis of 3-cyclohexenol derivatives. 2-Vinylcyclobutanones are prepared from α,β-unsaturated carbonyl compounds by the method of Trost and via [2 + 2]-cycloadditions of olefins and vinylketenes. Addition of hydride or alkyllithium reagents then generates 2-vinylcyclobutanol salts which directly rearrange to afford 3-cyclohexenols. The two methods constitute new [3 + 3]- and [4 +
2-乙烯基环丁醇的锂盐和钾盐在25–70°发生乙烯基环丁烷重排,为合成3-环己烯醇衍生物提供了一种有效的方法。2-乙烯基环丁酮是通过Trost的方法,通过烯烃和乙烯基烯酮的[2 + 2] -环加成反应,由α,β-不饱和羰基化合物制得的。然后加入氢化物或烷基锂试剂,生成2-乙烯基环丁醇盐,其可直接重排得到3-环己醇。这两种方法构成6元碳环的新[3 + 3]-和[4 + 2]环行方法。