Catalytic Asymmetric Bromination of Unfunctionalized Olefins with H<sub>2</sub>O as a Nucleophile
作者:Xun Zhang、Jing Li、Hua Tian、Yian Shi
DOI:10.1002/chem.201502133
日期:2015.8.10
The dimeric cinchona alkaloid (DHQD)2PHAL is used to catalyze an effective asymmetric bromohydroxylation of unfunctionalized olefins with H2O as nucleophile an N‐bromobenzamide as a bromine source. A variety of optically active bromohydrins are formed with up to 88 % ee.
Enantioselective reduction of ketones with triethoxysilane catalyzed by chiral bis-oxazoline titanium complexes
作者:Marco Bandini、Pier Giorgio Cozzi、Lucia Negro、Achille Umani-Ronchi
DOI:10.1039/a807028h
日期:——
Chiral bis-oxazoline titanium complexes [Ti(BOX)2X2] prepared from C2 chiral bis-oxazolines, BuLi and titanium salts, catalyze the enantiosective reduction of ketones in the presence of triethoxysilane.