Prochiral sulfides react with PhINTs in the presence of a catalytic amount of CuI salt together with chiral 4,4′-disubstituted bis(oxazoline) ligands to afford the corresponding chiral sulfimides.
作者:Hiroya Takada、Yoshiaki Nishibayashi、Kouichi Ohe、Sakae Uemura、Charlotte P. Baird、Tim J. Sparey、Paul C. Taylor
DOI:10.1021/jo970798d
日期:1997.9.1
A direct catalytic imidation of sulfides to sulfimides with [N-(p-tolylsulfonyl)imino]phenyliodinane (TsN=IPh) using a catalytic amount of copper triflate (CuOTf) has been developed. The reaction proceeds with a wide range of sulfides to give the corresponding sulfimides in 50-83% isolated yields. When the reaction is applied to allylic sulfides, the products are the corresponding sulfonamides produced via [2,3] sigmatropic rearrangement of the initially formed allylic sulfimides. In the presence of a chiral bis(oxazoline) as ligand, asymmetric induction occurs to afford the chiral sulfimides (up to 71% ee) and sulfonamides (up to 58% ee). Chloramine T (TsNClNa) can be used in place of TsN=IPh for asymmetric sulfimidation, but the ee's are much lower. Some mechanistic observations are described.
Imino‐λ
<sup>3</sup>
‐iodane and Catalytic Amount of I
<sub>2</sub>
‐Mediated Synthesis of
<i>N</i>
‐Allylsulfenamides via [2,3]‐Sigmatropic Rearrangement
作者:Cody L. Makitalo、Akira Yoshimura、Gregory T. Rohde、Irina A. Mironova、Rosa Y. Yusubova、Mekhman S. Yusubov、Viktor V. Zhdankin、Akio Saito
DOI:10.1002/ejoc.202000961
日期:2020.11.8
Imino‐λ3‐iodane and catalytic I2‐mediated facile metal‐free [2,3]‐sigmatropicrearrangement reaction of allyl sulfides producing N‐allysulfenamiides has been developed