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
Reductive Asymmetric Aza‐Mislow‐Evans Rearrangement by 1,3,2‐Diazaphospholene Catalysis**
作者:Guoting Zhang、Nicolai Cramer
DOI:10.1002/anie.202301076
日期:——
A 1,3,2-diazaphospholene-catalyzed three-step cascade transformation of chiral N-sulfinyl acrylamides comprised of a conjugate reduction, enantiospecific [2,3]-sigmatropic aza-Mislow-Evans rearrangement, and subsequent S−O bond reductive cleavage provides access to synthetically valuable enantio-enriched α-hydroxy amides. Various α-hydroxy amides are obtained in good yields and high enantioselectivities