A new synthesis of α,α-disubstituted carbonyl compounds from carbonyl compounds with one-carbon homologation
作者:Tsuyoshi Satoh、Kohsuke Miyashita
DOI:10.1016/j.tetlet.2004.04.154
日期:2004.6
with carbonyl compounds to afford adducts in high to quantitative yields. The adducts were treated with t-BuMgCl or LDA to give magnesium or lithium alkoxides, which were treated with i-PrMgCl or t-BuLi to afford the enolate with one-carbon elongation through β-oxido carbenoids. The enolate intermediates were found to be able to be trapped with electrophiles to give α,α-disubstituted carbonyl compounds
使1-氯烷基对甲苯基亚砜的α-亚磺酰基锂与羰基化合物反应,以高收率或定量收率得到加合物。用t- BuMgCl或LDA处理加合物得到镁或锂的醇盐,将其用i- PrMgCl或t - BuLi处理以得到通过β-氧化类胡萝卜素具有一碳延伸的烯醇化物。发现烯醇酸酯中间体能够被亲电子试剂捕获,以中等至良好的产率得到α,α-二取代的羰基化合物。总的来说,该方法提供了一种新的良好方法,该方法仅需两个合成步骤即可从羰基化合物中合成具有碳原子同构关系的α,α-二取代羰基化合物。