A Convenient Synthetic Access
to δ-Amino-γ,γ-difluoro-β-ketoesters
作者:Shizheng Zhu、Yanli Wang
DOI:10.1055/s-2002-33905
日期:——
The zinc-cuprous chloride promoted Reformatsky-imine addition reaction of 4-bromo-4,4-difluoroacetoacetate with aldimines derived from aromatic aldehydes and with ketimines derived from aryl alkyl ketone provided an efficient and practical access to δ-amino-γ,γ-difluoro-β-ketoesters. The scope and limitation of this procedure are also discussed.
Convenient Synthesis of Polyfunctionalized β-Fluoropyrroles from Rhodium(II)-Catalyzed Intramolecular N−H Insertion Reactions
作者:Yanli Wang、Shizheng Zhu
DOI:10.1021/ol0275670
日期:2003.3.1
Polyfunctionalized beta-fluoropyrrole can be readily prepared from rhodium(II) acetate-catalyzed intramolecular N-H insertion reaction of delta-amino-gamma,gamma-difluoro-alpha-diazo-beta-ketoesters. A cyanomethylene group can be introduced at C-3 of the pyrrole ring through the Wittig reaction of the diazo compounds followed by rhodium(II)-catalyzedintramolecular N-H insertion reactions.