Catalytic, stereospecific syn-dichlorination of alkenes
作者:Alexander J. Cresswell、Stanley T.-C. Eey、Scott E. Denmark
DOI:10.1038/nchem.2141
日期:2015.2
As some of the oldest organic chemical reactions known, the ionic additions of elemental halogens such as bromine and chlorine to alkenes are prototypical examples of stereospecific reactions, typically delivering vicinal dihalides resulting from anti-addition. Although the invention of enantioselective variants is an ongoing challenge, the ability to overturn the intrinsic anti-diastereospecificity
The Cu(OTf)2-catalyzed alkyl-alkyl coupling reaction of secondaryalkyl sulfonates with RLi-based reagents prepared by transmetalation with soluble MgBr2 ⋅ THF3 in THF proceeded with inversion of the configuration. RLi examined were nBuLi, sBuLi, and Ph(CH2)4Li. In contrast, soluble MgCl2 ⋅ THF2 in THF was suited for MeLi. (S)-14-Methyloctadecan-2-one, a sex pheromone produced by lichen moths, was
Oxidative Cleavage of Silyl Ethers by an Oxoammonium Salt
作者:Nicholas Leadbeater、Jacob Loman、Vincent Pistritto、Christopher Kelly
DOI:10.1055/s-0035-1561498
日期:——
A method for the oxidativecleavage of silyl ethers to their corresponding carbonyl species mediated by an oxoammonium salt is described. The resulting aldehydes and ketones are obtained under mild reaction conditions with no observed overoxidation. For robust substrates, heating to reflux temperatures significantly reduces the reaction time.
An extremely mild desulfurization of thiiranes; an efficient transformation from geraniol to (+)- and (−)-linalool
作者:Jun'ichi Uenishi、Yuhki Kubo
DOI:10.1016/s0040-4039(00)73471-x
日期:1994.9
Thiirane was transformed to alkene very efficiently at −78°C by triethylborane initiated radical reaction with tributyltinhydride. Enantiomerically pure (+)- and (−)-linalools were derived from geraniol in four steps including the alkene formation reaction.