Stereospecific Cross-Coupling of Secondary Alkyl β-Trifluoroboratoamides
摘要:
The stereospecific cross-coupling of enantioenriched nonbenzylic secondary alkyl boron compounds has been achieved. The high selectivity toward product formation over an undesired beta-H elimination pathway is achieved via an intramolecular coordination of an ancillary carbonyl to the metal center in the diorganopalladium intermediate.
An efficient procedure for the synthesis of functionalized 3,4-dihydro-2H-pyrans via catalytic multicomponent reaction
作者:Alireza Samzadeh-Kermani、Sajjad Ataeifar
DOI:10.1007/s00706-017-2065-y
日期:2018.1
with reactive nitrilium ion derived from the reaction of isocyanides and oxiranes in the presence of lithium salts in PEG-400. The reaction was successfully utilized to synthesize 3,4-dihydro-2H-pyrans in accordance with a simple and environmentally benign procedure. The optimized reaction conditions allowed the selective synthesis of the highly functionalized 3,4-dihydro-2H-pyrans from the commercially
Method for preparing optically active beta-butyrolactones
申请人:Watanabe Shinya
公开号:US20060046286A1
公开(公告)日:2006-03-02
The present invention is to provide a method for preparing easily and efficiently β-butyrolactones and/or optically active 3-hydroxycarboxylic acid derivatives in high optical purity by use of an easily available hydrolase, which are useful as intermediates for pharmaceuticals, agrochemicals and the like. More particularly, the present invention relates to a method for preparing β-butyrolactones and/or optically active 3-hydroxycarboxylic acid derivatives with an optical purity of substantially 100% ee, comprising reacting a β-butyrolactone which is a mixture of optical isomers, with a nucleophilic agent in the presence of a hydrolase, provided that a lipase derived from porcine pancreas is excluded.
Copper-Catalyzed β-Boration of α,β-Unsaturated Carbonyl Compounds with Tetrahydroxydiborane
作者:Gary A. Molander、Silas A. McKee
DOI:10.1021/ol201900d
日期:2011.9.2
The copper-catalyzed beta-boration of alpha,beta-unsaturated carbonyl compounds with tetrahydroxydiborane has been developed. This diboron reagent allows direct, efficient access to boronic acids and their derivatives. Primary, secondary, and tertiary alpha,beta-unsaturated amides are converted to the corresponding beta-trifluoroboratoamides in good to excellent yields. The beta-boration of a variety of alpha,beta-unsaturated esters and ketones is also reported.