A new convenient metal-free oxidation protocol of a wide variety of alkenes with molecularoxygen and benzaldehyde under visible lightirradiation of fluorescent lamp afforded their corresponding epoxides in 49―99% yields.
Ti-Catalyzed Radical Alkylation of Secondary and Tertiary Alkyl Chlorides Using Michael Acceptors
作者:Xiangyu Wu、Wei Hao、Ke-Yin Ye、Binyang Jiang、Gisselle Pombar、Zhidong Song、Song Lin
DOI:10.1021/jacs.8b08605
日期:2018.11.7
Alkylchlorides are common functional groups in synthetic organic chemistry. However, the engagement of unactivated alkylchlorides, especially tertiaryalkylchlorides, in transition-metal-catalyzed C-C bond formation remains challenging. Herein, we describe the development of a TiIII-catalyzed radical addition of 2° and 3° alkylchlorides to electron-deficient alkenes. Mechanistic data are consistent
An Efficient Catalytic Asymmetric Epoxidation Method
作者:Zhi-Xian Wang、Yong Tu、Michael Frohn、Jian-Rong Zhang、Yian Shi
DOI:10.1021/ja972272g
日期:1997.11.1
This article describes a highly effective catalyticasymmetricepoxidation method for olefins using potassium peroxomonosulfate (Oxone, Dupont) as oxidant and a fructose-derived ketone (1) as catalyst. High enantioselectivies have been obtained for trans-disubstituted and trisubstituted olefins which can bear functional groups such as tributylsilyl ether, acetal, chloride, and ester. The enantiomeric
Reaction of epoxides with [n-Bu3SnAlMe3]−Li+ affords β-oxido stannanes which collapse to alkene with overall retention of stereochemistry. The SN2 type ring opening of epoxides by tributylstannyl anion followed by anti elimination of Bu3Sn and OAl−Me3 groups explains the stereochemical results. The method can be successfully applied to hydroxy epoxides derived from (E)-2-nonen-1-ol. The deoxygenation of epoxides
Bi(III)-mandelate/DMSO : A new oxidizing system for the catalyzed CC cleavage of epoxides
作者:Thomas Zevaco、Elisabet Duñach、Michèle Postel
DOI:10.1016/s0040-4039(00)77635-0
日期:1993.4
Bi(III)-mandelate was found to be an effective catalyst for the oxidative CC bond cleavage of epoxides and their transformation into carboxylic acids in anhydrous DMSO medium.