Selective acetylation of primary alcohols by ethyl acetate
作者:Raju Singha、Jayanta K. Ray
DOI:10.1016/j.tetlet.2016.10.088
日期:2016.11
A KOtBu and ethyl acetate mediated efficient methodology has been developed for the acetylation of primary and secondaryalcohols where ethyl acetate is the source of acetyl group. The reaction is fast, mild, efficient, and highly selective towards the primary alcohols.
已经开发了用于叔和仲醇的乙酰化的KO t Bu和乙酸乙酯介导的有效方法,其中乙酸乙酯是乙酰基的来源。该反应对伯醇快速,温和,有效且高度选择性。
Electroreductive formylation of activated alcohols<i>via</i>radical–polar crossover
作者:Jungtaek Kang、Heyjin Cho、Hyunwoo Kim
DOI:10.1039/d3cc01529g
日期:——
The direct synthesis of sterically hindered aldehydes is highly challenging. Herein, we report a direct approach to generate such compounds via electroreductive cleavage of the C(sp3)–O bond of activated alcohols. Under the established reaction conditions, benzylic radical intermediates were efficiently generated. A subsequent radical–polar crossover generated carbanions that further reacted with N
Enantioselective acylation of chroman-4-ols catalysed by lipase from Pseudomonas cepecia (Amano PS)
作者:S Ramadas、G.L David Krupadanam
DOI:10.1016/s0957-4166(97)00366-2
日期:1997.9
Lipase Amano PS catalysed acylation of (+/-)-chroman-4-ols using vinyl acetate as the acyl donor in n-hexane gave (R)-(+)-chroman-4-ol acetates and (S)-(-)-chroman-4-ols in high enantiomeric excess. The relationship between the position of the substituents in the chroman-4-ol to the ee and the spatial characteristics of the enzyme active site are proposed. (C) 1997 Elsevier Science Ltd.