Modular chiral thiazolidine catalysts in asymmetric aryl transfer reactions
摘要:
Modular chiral thiazolidine derivatives were synthesized in a single step from inexpensive and commercially available starting materials. These ligands catalyzed enantioselective arylation of different aldehydes using aryl boronic acids as a source of transferable aryl groups. The products were obtained in excellent yields and good enantioselectivities. (c) 2006 Elsevier Ltd. All rights reserved.
Chemoselectivity and stereoselectivity of cyclisation pathways leading to bicyclic tetramates controlled by ring-chain tautomerisation in thiazolidines
作者:Tharindi D. Panduwawala、Sarosh Iqbal、Rémi Tirfoin、Mark G. Moloney
DOI:10.1039/c6ob00557h
日期:——
Chemoselective Dieckmann cyclisation reactions on N-malonyl thiazolidine templates derived from cysteine and pivaldehyde or aromatic aldehydes may be used to access bicyclic tetramates, for which different pathways operate as a result of differing ring-chain tautomeric behaviour of the respective intermediate imines.
Scalar Cross-Relaxation Detected in the NOESY Spectra of Oxazolidines and Thiazolidines
作者:Tharindi D. Panduwawala、Laia Josa-Culleré、Ilya Kuprov、Barbara Odell、Mark G. Moloney、Timothy D. W. Claridge
DOI:10.1021/acs.joc.6b00458
日期:2016.5.20
Anomalous cross-peaks observed in the NOESY spectra of 2,4-disubstituted thiazolidines and oxazolidines that cannot be attributed to classical dipolar NOE or chemical exchange peaks have been investigated experimentally and computationally and have been shown to arise from scalar cross-relaxation of the first kind. This process is stimulated by the relatively slow modulation of scalar couplings and
The reduction of aromatic ketones by borane in the presence of the inseparable diastereoisomeric mixture of 2-substituted thiazolidine-4-methanol has been investigated. Modest to high enantiomeric excesses were obtained increasing with thiazolidine steric hindrance. (C) 1997 Elsevier Science Ltd.