Addition–Rearrangement of Ketenes with Lithium<i>N</i>-<i>tert</i>-Butanesulfinamides: Enantioselective Synthesis of α,α-Disubstituted α-Hydroxycarboxylic Acid Derivatives
作者:Peng-Ju Ma、Fan Tang、Yun Yao、Chong-Dao Lu
DOI:10.1021/acs.orglett.9b01555
日期:2019.6.21
Addition of the lithium salts of chiral N-substituted tert-butanesulfinamides to ketenes and subsequent silylation initiates stereoselective [2,3]-rearrangement, which affords enantioenriched α,α-disubstituted α-sulfenyloxy carboxamides through a reaction that faithfully transfers the absolute stereochemistry of the lithiated sulfinylamides to the α-carbon of the amide products. This addition–rearrangement
将手性N-取代叔丁亚磺酰胺的锂盐加到乙烯酮中,随后进行甲硅烷基化反应,引发立体选择性[2,3]-重排,该反应可通过忠实地转移绝对立体化学的反应得到对映体富集的α,α-二取代的α-亚磺酰氧基羧酰胺。将锂化的亚磺酰胺转化为酰胺产物的α-碳。这种加成-重排可以与在单个烧瓶中由酰氯形成乙烯酮一起进行,从而提供了一种新的实用的合成α-羟基羧酸衍生物的途径。