Highly Diastereoselective and Enantioselective Formal [4 + 1] Ylide Annulation for the Synthesis of Optically Active Dihydrofurans
作者:Jun-Cheng Zheng、Chun-Yin Zhu、Xiu-Li Sun、Yong Tang、Li-Xin Dai
DOI:10.1021/jo801135j
日期:2008.9.1
On the basis of the reactions of camphor-derived sulfur ylide with alpha-ylidene-beta-diketones, highly efficient and selective synthesis of opticallyactive dihydrofurans has been achieved.
The Reactions of α-Ylidene (Vinylidene, Benzylidene, Styrylmethylidene) Bis[carbonyls] with Copper Mono/Bis[carbonylcarbenoids]
作者:Gökçe Merey、Mustafa Kaya、Olcay Anaç
DOI:10.1002/hlca.201200004
日期:2012.8
bis‐ketones/bis‐esters/bis‐keto esters with dimethyl diazomalonate and ethyl diazoacetate were studied. Total steric/electronic convenience of the present reaction paths was investigated. Methoxy/nitro substituents in m‐/p‐positions on benzylidene biscarbonyls did not alter the general routes of the reactions, supporting concerted mechanism. Dihydrobenzoxepine/oxepine formation was sterically sensitive