Catalytic aerobic oxidative decarboxylation of α-trifluoromethyl-α-hydroxy acids to trifluoromethyl ketones
摘要:
The oxidative decarboxylation of alpha-trifluoromethyl-alpha-hydroxy acids to trifluoromethyl ketones is carried out under mild catalytic aerobic conditions using a cobalt(Ill) complex in the presence of pivalaldehyde. (C) 2002 Elsevier Science Ltd. All rights reserved.
A ligand-free strategy for the copper-catalysed direct alkynylation of trifluoromethyl ketones
作者:Lei Wang、Ning Liu、Bin Dai、Xiaowei Ma、Lei Shi
DOI:10.1039/c4ra14322a
日期:——
A superbase-induced copper-catalyzed direct alkynylation method for trifluoromethyl ketones was developed without any additional ligand under mild conditions.
Thinking outside the box: A newly developed C1‐symmetric Rh/Phebox complex efficiently catalyzed the asymmetricalkynylation of α‐ketoester 1 with various aryl and alkyl substituted terminal alkynes to provide the corresponding chiral tertiary propargylic alcohols with up to 99 % ee (see scheme; TMS=trimethylsilyl).
A novel ruthenium catalyst is introduced which contains solely achiral ligands and acquires its chirality entirely from octahedral centrochirality. The configurationally stable catalyst is demonstrated to catalyze the alkynylation of trifluoromethyl ketones with very high enantioselectivity (up to >99% ee) at low catalyst loadings (down to 0.2 mol%).