Highly Diastereoselective Addition of Alkynylmagnesium Chlorides to <i>N</i>-<i>tert</i>-Butanesulfinyl Aldimines: A Practical and General Access to Chiral α-Branched Amines
作者:Bai-Ling Chen、Bing Wang、Guo-Qiang Lin
DOI:10.1021/jo902424m
日期:2010.2.5
N-tert-butanesulfinyl imines proceeded with a remarkably high diastereoselectivity (dr > 13:1, mostly diastereopure), and with a general scope of both reaction partners. The high dr translated into simplified purification and higher optical purity for the synthesis of a wide array of chiral α-branched amines. The alkyne functionality also provides a multitude of opportunities for further synthetic transformations
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.