Diastereoselective Aza‐Mislow–Evans Rearrangement of
<i>N</i>
‐Acyl
<i>tert</i>
‐Butanesulfinamides into α‐Sulfenyloxy Carboxamides
作者:Fan Tang、Yun Yao、Yan‐Jun Xu、Chong‐Dao Lu
DOI:10.1002/anie.201809551
日期:2018.11.19
diastereoselective [2,3] rearrangement of O‐silyl N‐sulfinyl N,O‐ketene acetals derived from chiral N‐acyl tert‐butanesulfinamides was developed, giving α‐sulfenyloxy carboxamides with excellent enantioselectivity. Enolization and subsequent silylation of N‐acyl tert‐butanesulfinamides initiate this aza variant of the Mislow–Evans rearrangement, in which the chirality at the sulfur atom in the rearrangement precursors
衍生自手性N-酰基叔丁烷亚磺酰胺的O-甲硅烷基N-亚磺酰基N,O-酮缩醛的非对映选择性[2,3]重排,使α-亚磺酰氧基羧酰胺具有出色的对映选择性。N-酰基叔丁烷亚磺酰胺的烯醇化和随后的甲硅烷基化引发了Mislow-Evans重排的aza变体,其中重排前体中硫原子的手性被忠实地转移到了产品的α-碳立体中心。Ellman亚磺酰胺通常用作手性氨当量,可在此重排中用作不对称合成α-氧官能化羧酰胺的手性前体。