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.
metal-free reductionsystem, in which H2Se (or HSe–) produced in situ from Se/DMF/H2O acts as the active reducing species, has been developed. By using water as an inexpensive, safe, and environmentally friendly surrogate as the hydrogen donor, this newreductionsystem incorporating Se/DMF/H2O displayed high selectivity and good activity in the reduction of α,β-unsaturated ketones and alkynes. Therefore
一种新型的无金属还原系统,其中H 2 SE(或HSE组- )原位产生从硒/ DMF / H 2 ö充当活性还原物质,已经研制成功。通过使用水作为廉价,安全和环保的替代物作为氢供体,这种结合了SE / DMF / H 2 O的新还原系统在还原α,β-不饱和酮和炔烃方面显示出高选择性和良好的活性。因此,该还原系统具有很大的潜力,可以作为有机转化中通用而实用的还原方法。
Transformation of 3-(Furan-2-yl)-1,3-di(het)arylpropan-1-ones to Prop-2-en-1-ones via Oxidative Furan Dearomatization/2-Ene-1,4,7-triones Cyclization
作者:Roman O. Shcherbakov、Diana A. Eshmemet’eva、Anton A. Merkushev、Igor V. Trushkov、Maxim G. Uchuskin
DOI:10.3390/molecules26092637
日期:——
3-(furan-2-yl)-1,3-di(het)arylpropan-1-ones followed by an unusual cyclization of the formed di(het)aryl-substituted 2-ene-1,4,7-triones has been developed. The cyclization step is related to the Paal–Knorr synthesis, but the furan ring formation is accompanied in this case by a formal shift of the double bond through the formation of a fullyconjugated 4,7-hydroxy-2,4,6-trien-1-one system or its surrogate.