Carbamoyl Anion Addition to <i>N</i>-Sulfinyl Imines: Highly Diastereoselective Synthesis of α-Amino Amides
作者:Jonathan T. Reeves、Zhulin Tan、Melissa A. Herbage、Zhengxu S. Han、Maurice A. Marsini、Zhibin Li、Guisheng Li、Yibo Xu、Keith R. Fandrick、Nina C. Gonnella、Scot Campbell、Shengli Ma、Nelu Grinberg、Heewon Lee、Bruce Z. Lu、Chris H. Senanayake
DOI:10.1021/ja402647m
日期:2013.4.17
Carbamoyl anions, generated from N,N-disubstituted formamides and lithium diisopropylamide, add with high diastereoselectivity to chiral N-sulfinyl aldimines and ketimines to provide α-amino amides. The methodology enables the direct introduction of a carbonyl group without the requirement of unmasking steps as with other nucleophiles. The products may be converted to α-amino esters or 1,2-diamines
由 N,N-二取代甲酰胺和二异丙基氨基锂生成的氨基甲酰基阴离子以高非对映选择性添加到手性 N-亚磺酰基醛亚胺和酮亚胺中以提供 α-氨基酰胺。该方法能够直接引入羰基,而无需像其他亲核试剂那样进行暴露步骤。产物可转化为α-氨基酯或1,2-二胺。该反应的迭代应用使二肽的立体选择性合成成为可能。光谱和计算研究支持具有 η(2) 配位锂的羰基阴离子结构。