A Flexible and Stereoselective Synthesis of Azetidin-3-ones through Gold-Catalyzed Intermolecular Oxidation of Alkynes
作者:Longwu Ye、Weimin He、Liming Zhang
DOI:10.1002/anie.201007624
日期:2011.3.28
Chiral rings made easy: Chiral azetidin‐3‐ones have been easily prepared from chiral N‐propargylsulfonamides, which in turn are readily accessible through chiral sulfinamide chemistry (see scheme). Using tert‐butylsulfonyl as the protecting group avoids unnecessary deprotection and reprotection steps, and allows its removal from the azetidine ring under acidic conditions.
手性环变得容易:手性氮杂环丁烷-3-酮可以很容易地由手性N-炔丙基磺酰胺制备,而手性N-炔丙基磺酰胺又可以通过手性亚磺酰胺化学轻松获得(参见方案)。使用叔丁基磺酰基作为保护基团避免了不必要的脱保护和再保护步骤,并允许其在酸性条件下从氮杂环丁烷环上脱除。