A class of polysubstituted functionalized furans was synthesized efficiently starting from readily available furans involving the oxidative ringopening of the furanrings using NBS as an oxidant. The reaction proceeded through a sequence of oxidative dearomatization of the furanring/spirocyclization/aromatization.
Rapid and Regioselective Hydrogenation of α,β-Unsaturated Ketones and Alkylidene Malonic Diesters Using Hantzsch Ester Catalyzed by Titanium Tetrachloride
作者:Yulin Lam、Jun Che
DOI:10.1055/s-0030-1258556
日期:2010.10
A regioselective hydrogenation of α,β-unsaturated ketones and alkylidenemalonic diesters using Hantzsch ester as the reducing agent and titanium tetrachloride as a catalyst is described. The short reaction times and mild reaction conditions are the advantages of this method.
Unnatural α-amino ethyl esters from diethyl malonate or ethyl β-bromo-α-hydroxyiminocarboxylate
作者:Eloi P Coutant、Vincent Hervin、Glwadys Gagnot、Candice Ford、Racha Baatallah、Yves L Janin
DOI:10.3762/bjoc.14.264
日期:——
We have explored here the scope of the age-old diethyl malonate-based accesses to α-aminoesters involving Knoevenagel condensations of diethyl malonate on aldehydes, reductions of the resulting alkylidenemalonates, the preparation of the corresponding α-hydroxyimino esters and their final reduction. This synthetic pathway turned out to be general although some unexpected limitations were encountered