Synthesis of β-disubstituted β-amino isoxazolyl ketones by addition of ketimines with isoxazolyl methyl ketone enolates
作者:Jason Guernon、Lawrence Marcin、Mendi Higgins、Fukang Yang、Jianliang Shi、Lawrence Snyder、Lorin A. Thompson、Yong-Jin Wu
DOI:10.1016/j.tetlet.2014.02.053
日期:2014.3
A series of β-disubstituted N-sulfinyl β-amino isoxazolyl ketones has been prepared by addition of tert-butanesulfinyl ketimines with the n-BuLi-generated enolates of isoxazolyl methylketones.
Highly Diastereoselective Synthesis of α-Difluoromethyl Amines from N-tert-Butylsulfinyl Ketimines and Difluoromethyl Phenyl Sulfone
作者:Jun Liu、Jinbo Hu
DOI:10.1002/chem.201000893
日期:——
with an in situgenerated PhSO2CF2− anion, which provides a powerful synthetic method for the preparation of a variety of structurally diverse homochiral α‐difluoromethyl tertiary carbinamines, including α‐difluoromethyl allylic amines and α‐difluoromethyl propargylamines. The stereocontrol mode of the present diastereoselective difluoromethylation of ketimines was found to be different from that of other
One-pot asymmetric synthesis of tert-butanesulfinyl-protected amines from ketones by the in situ reduction of tert-butanesulfinyl ketimines
作者:George Borg、Derek A. Cogan、Jonathan A. Ellman
DOI:10.1016/s0040-4039(99)01351-9
日期:1999.9
A one-pot method for the asymmetricsynthesis of tert-butanesulfinyl-protected amines is described. The ketones bd2 are condensed with (R)-tert-butanesulfinamide bd1 and the tert-butanesulfinyl imine intermediates reduced in situ with NaBH4 to afford the sulfinamides bd4 in 66–86% yield and with drs from 90:10 to 97:3 for both aryl alkyl and dialkylketones. Ti(OEt)4 serves as both a water scavenger
Microwave-Assisted Solvent-Free Synthesis of Enantiomerically Pure <i>N</i>-(<i>tert</i>-Butylsulfinyl)imines
作者:Juan F. Collados、Estefanía Toledano、David Guijarro、Miguel Yus
DOI:10.1021/jo300919x
日期:2012.7.6
environmentally friendly, and very efficient procedure for the synthesis of opticallypureN-(tert-butylsulfinyl)imines has been developed with microwave-promoted condensation of aldehydes and ketones using (R)-2-methylpropane-2-sulfinamide in the presence of Ti(OEt)4, under solvent-free conditions. This procedure allows for the preparation of a variety of sulfinyl aldimines with excellent yields and purities
Transition‐Metal‐Free Hydrogen Autotransfer: Diastereoselective N‐Alkylation of Amines with Racemic Alcohols
作者:Miao Xiao、Xin Yue、Ruirui Xu、Weijun Tang、Dong Xue、Chaoqun Li、Ming Lei、Jianliang Xiao、Chao Wang
DOI:10.1002/anie.201905870
日期:2019.7.29
of a ketone and NaOH, racemic secondary alcohols reacted with Ellman's chiral tert‐butanesulfinamide by a hydrogen autotransfer process to afford chiral amines with high diastereoselectivities (up to >99:1). Broad substrate scope and up to a 10 gram scale production of chiral amines were demonstrated. The method was applied to the synthesis of chiral deuterium‐labelled amines with high deuterium incorporation