Nickel-Catalyzed Asymmetric Kumada Cross-Coupling of Symmetric Cyclic Sulfates
作者:Meredith S. Eno、Alexander Lu、James P. Morken
DOI:10.1021/jacs.6b03384
日期:2016.6.29
Nickel-catalyzed enantioselective cross-couplings between symmetric cyclic sulfates and aromatic Grignard reagents are described. These reactions are effective with a broad range of substituted cyclic sulfates and deliver products with asymmetric tertiary carbon centers. Mechanistic experiments point to a stereoinvertive SN2-like oxidative addition of a nickel complex to the electrophilic substrate
Disclosed herein are compounds of the formula ##STR1## wherein R.sup.1 is hydrogen or (1-4C) alkyl, R.sup.2 is (1-4C) alkyl or a therapeutically acceptable salt thereof. The compounds are useful for treating herpes infections.
(EN) Disclosed herein are compounds of formula (I) wherein R1 is hydrogen or (1-4C)alkyl, R2 is (1-4C)alkyl or a therapeutically acceptable salt thereof. The compounds are useful for treating herpes infections.(FR) Composés de formule (I) dans laquelle R1 représente hydrogène ou alkyle (C1-C4), R2 représente alkyle (C1-C4) ou un de ses sels acceptables thérapeutiquement. Ces composés sont utiles pour le traitement d'infections herpétiques.
Transesterification of N-acyloxazolidinones with alcohol by lanthanum(III) Iodide
作者:Shin-ichi Fukuzawa、Yuki Hongo
DOI:10.1016/s0040-4039(98)00521-8
日期:1998.5
Transesterification of N-acyloxazolidinones by treatment with an alcohol and lanthanum(III) iodide gives the corresponding esters in good to excellent yields under mild conditions with negligible racemization. (C) 1998 Elsevier Science Ltd. All rights reserved.
A simple method removing 2-oxazolidinone and 2-hydroxyethylamine auxiliaries in methoxide–carbonate systems for synthesis of planar-chiral nicotinate
A facile and practical removal of 2-oxazolidinone and 2-hydroxyethylamine auxiliaries was accomplished by treating the corresponding N-acyl-2-oxazolidin one and N-(2-hydroxyethyl)amide derivatives in simple methoxide-carbonate systems. The presence of excess DMC (dimethyl carbonate) accelerates the N-acyl bond cleavage for those substrates under mild reaction conditions, and the present method was found to be useful especially for the synthesis of planar-chiral nicotinate. (C) 2003 Elsevier Science Ltd. All rights reserved.