One-pot fluorination followed by Michael addition or Robinson annulation for preparation of α-fluorinated carbonyl compounds
作者:Wen-Bin Yi、Xin Huang、Chun Cai、Wei Zhang
DOI:10.1039/c2gc36166c
日期:——
Fluorination followed by the Michael addition or Robinson annulation of 1,3-dicarbonylcompounds is introduced for the synthesis of acyclic and cyclic α-fluoro-β-ketoesters and α-fluoro-1,3-diketones. The decarboxylation step can also be added to the reaction sequence. High efficiency is achieved by the microwave heating and atom economic one-pot synthesis.
A novel one-pot fluorination and asymmetric Michael addition reaction sequence promoted by recyclable fluorous bifunctional cinchona alkaloid–thiourea organocatalysts is introduced for the synthesis of α-fluoro-β-ketoesters bearing two chiral centers.
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.
Iridium-Catalyzed Asymmetric Hydrogenation of Tetrasubstituted α-Fluoro-β-enamino Esters: Efficient Access to Chiral α-Fluoro-β-amino Esters with Two Adjacent Tertiary Stereocenters
An iridium-catalyzed highly efficient asymmetric hydrogenation of challenging tetrasubstituted α-fluoro-β-enamino esters was successfully developed using bisphosphine–thiourea (ZhaoPhos) as the ligand, which prepared a series of chiral α-fluoro-β-amino esters containing two adjacent tertiary stereocenters with high yields and excellent diastereoselectivities/enantioselectivities (73%–99% yields, >25:1
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.