An expedient stereoselective synthesis of ( E )- α,β -unsaturated esters and thioesters using FeCl 3 ·6H 2 O
作者:Amar R. Mohite、Trimbak B. Mete、Ramakrishna G. Bhat
DOI:10.1016/j.tetlet.2017.01.024
日期:2017.2
Facile and convenient synthesis of α,β-unsaturatedesters and thioesters from alkylidene derivatives of Meldrum’s Acid is described. This method uses catalytic amount of FeCl3·6H2O (0.001–0.005 equiv) with alcohols/thiols (1 equiv) in dry CH3NO2 followed by catalytic amount of piperidine. A variety of α,β-unsaturatedesters and thioesters have been synthesized with high E-stereoselectivity in good
描述了从Meldrum's Acid的亚烷基衍生物容易且方便地合成α,β-不饱和酯和硫代酯。该方法在干燥的CH 3 NO 2中使用催化量的FeCl 3 ·6H 2 O(0.001-0.005当量)与醇/硫醇(1当量),然后催化量的哌啶。已经以高至优异的产率合成了具有高E-立体选择性的多种α,β-不饱和酯和硫代酯。该方法的应用通过辛辛酸,防晒剂和其他对甲氧基肉桂酸酯的克规模合成得到证明。
Ruthenium(II)-Catalyzed Decarboxylative C−H Activation: Versatile Routes to<i>meta</i>-Alkenylated Arenes
作者:N. Y. Phani Kumar、Alexander Bechtoldt、Keshav Raghuvanshi、Lutz Ackermann
DOI:10.1002/anie.201600490
日期:2016.6.6
Ruthenium(II) bis(carboxylate)s proved highly effective for two decarboxylative C−Halkenylationstrategies. The decarboxylation proceeded efficiently at rather low temperatures. The unique versatility of the decarboxylative ruthenium(II) catalysis is reflected in the oxidative olefinations with alkenes as well as the redox‐neutral hydroarylations of alkynes.