Studies of ring-closing mode of 4-hydroxy-2-vinylidenebutanoates: 5-exo-trig versus 5-endo-dig
作者:Shinji Kitagaki、Daisuke Shibata、Chisato Mukai
DOI:10.1016/j.tetlet.2007.01.037
日期:2007.3
The ring-closing mode of benzyl 4-hydroxy-2-vinylidenebutanoates (5-exo-trig vs 5-endo-dig) could precisely be controlled in a highly selective manner by the proper choice of conditions (solvent and base). (c) 2007 Elsevier Ltd. All rights reserved.
Investigation of oxacycle formation by base-promoted endo-mode ring-closing reaction of allenes
The base-promoted endo-mode ring closure of electron-withdrawing group-substituted allenes provided the following interesting results: (1) the endo-mode ring-closing reaction of 1-(benzyloxycarbonyl)-1-(ω-hydroxyalkyl)allenes smoothly proceeded during the formation of five-, seven-, and eight-membered rings; (2) base treatment of benzyloxycarbonylallene and sulfonylallene, having a 2-hydroxyethyl group