Highly Enantioselective Amination Reactions of Fluorinated Keto Esters Catalyzed by Novel Chiral Guanidines Derived from Cinchona Alkaloids
作者:Xiao Han、Fangrui Zhong、Yixin Lu
DOI:10.1002/adsc.201000562
日期:2010.11.2
NovelCinchona alkaloid-derived guanidinescatalyze stereoselective aminations of fluorinatedketoesters, affording products with fluorine-containing quaternary stereogenic centers in excellent yields and with moderate to high enantioselectivities.
available Cinchonaalkaloid as catalyst, the asymmetric allylic alkylation of Morita-Baylis-Hillmancarbonates, with alpha-fluoro-beta-keto esters as nucleophiles, have been successfully developed. A series of important fluorinated adducts, with chiral quaternary carbon centres containing a fluorine atom, was achieved in good yields (up to 93%), with good to excellent enantioselectivities (up to 96%
Acylation of α-fluorophosphonoacetate derivatives using magnesium chloride-triethylamine
作者:Dae Young Kim、Yong Mi Lee、Young Jae Choi
DOI:10.1016/s0040-4020(99)00807-8
日期:1999.11
Acylation of alpha-fluorophosphonoacetate derivatives in the presence of magnesium chloride-triethylamine has been described. Acylations of triethyl alpha-fluorophosphonoacetate 1 and diethyl alpha-fluorophosphonoacetic acid 7 were proceeded under mild conditions to provide alpha-fluoro-beta-keto esters 3 and alpha-fluoro-beta-keto phosphonates 9, respectively, in high yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
Catalytic asymmetric Mannich-type reactions of fluorinated ketoesters with N-Boc aldimines in the presence of chiral palladium complexes
作者:Young Ku Kang、Dae Young Kim
DOI:10.1016/j.tetlet.2011.02.087
日期:2011.5
The catalytic enantioselective Mannich reaction promoted by chiral palladium complexes is described. The treatment of alpha-fluoro-beta-ketoesters with N-Boc-aldimines under mild reaction conditions afforded the corresponding beta-aminated alpha-fluoro-beta-ketoesters with excellent enantioselectivities (up to 99% ee). (C) 2011 Elsevier Ltd. All rights reserved.
Acylation of diethyl (ethoxycarbonyl)fluoromethylphosphonate using magnesium chloride-triethylamine: A facile synthesis of α-fluoro β-keto esters
作者:Dae Young Kim、Dae Yong Rhie、Dong Young Oh
DOI:10.1016/0040-4039(95)02224-4
日期:1996.1
A facile synthesis of α-fluoro β-keto esters, via diacylation reaction of diethyl (ethoxycarbonyl)fluoromethylphosphonate with aromatic carboxylic acid chlorides in the presence of magnesium chloride-triethylamine followed by deacylation, is described.