Synthesis of 1,2,3-trisubstituted cyclopropanes by MIRC reactions of dithianyllithiums with monocarboxylic vinyl epoxide analogues
作者:Shouchu Tang、Xingang Xie、Xing Huo、Qiren Liang、Xuegong She、Xinfu Pan
DOI:10.1016/j.tetlet.2005.10.167
日期:2006.1
A variety of cyclopropane derivatives bearing stereochemistry at all three positions on the ring were readily obtained in a high yield of 76–92% and high stereoselectivity (trans:cis > 95:5) when the monocarboxylic vinyl epoxide analogues reacted with dithianyllithiums in the presence of HMPA. This reaction was supposed to be a tandem conjugation addition-opening epoxide ring sequence.
SmI2-Induced highly regioselective reduction of α,β-epoxy esters and γ,δ-epoxy-α,β-unsaturated esters. An efficient route to optically active β-hydroxy and δ-hydroxy esters
作者:Kenji Otsubo、Junji Inanaga、Masaru Yamaguchi
DOI:10.1016/s0040-4039(00)96532-8
日期:1987.1
α,β-Epoxy esters were rapidly reduced at room temperature to yield β-hydroxy esters with retention of the configurations at the β-carbon atoms by using SmI2-THF-HMPA system in the presence of N,N-dimethylaminoethanol (DMAE). The conditions were successfully applied to the synthesis of vinylogous δ-hydroxy esters.
Mixed peroxides from the chloroperoxidase-catalyzed oxidation of conjugated dienoic esters with a trisubstituted terminal double bond
作者:Despina J. Bougioukou、Ioulia Smonou
DOI:10.1016/s0040-4039(02)00819-5
日期:2002.6
The chloroperoxidase (CPO)-catalyzed oxidations of conjugated dienoic esters with a trisubstituted terminal doublebond were studied by using tert-butyl hydroperoxide as the terminal oxidant. Most of the substrates gave disubstituted mixed peroxides as the major products.