A Versatile and Highly Selective Hypervalent Iodine (III)/2,2,6,6-Tetramethyl-1-piperidinyloxyl-Mediated Oxidation of Alcohols to Carbonyl Compounds
摘要:
Catalytic amounts of 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) are used in combination with [bis(acetoxy)iodo]benzene (BAIB) as a stoichiometric oxidant in the conversion of primary and secondary alcohols to carbonyl compounds. This procedure works efficiently at room temperature in almost all common solvents and neat in some cases. This process exhibits a very high degree of selectivity for the oxidation of primary alcohols to aldehydes, without any noticeable overoxidation to carboxyl compounds, and a high chemoselectivity in the presence of either secondary alcohols or of other oxidizable moieties. This procedure allows an easy, convenient, high-yielding method for the oxidation of alcohols starting from commercially available compounds.
Treatment of (2,3-epoxy-4-pentenyloxy)trialkylsilane with radical precursors such as triphenylgermane and α-halo carbonyl compounds in the presence of Et 3 B yields a, β-unsaturated aldehydes. The reaction involves β-scission of a secondary alkoxy radical that releases a siloxymethyl radical.
在 Et 3 B 存在下,用自由基前体(例如三苯基锗烷和 α-卤代羰基化合物)处理(2,3-环氧-4-戊烯氧基)三烷基硅烷产生 a, β-不饱和醛。该反应涉及二级烷氧基的 β 断裂,从而释放出甲硅烷氧基甲基自由基。
Iqbal, Javed; Khan, M. Amin, Synthetic Communications, 1989, vol. 19, # 3and4, p. 515 - 522
作者:Iqbal, Javed、Khan, M. Amin
DOI:——
日期:——
Kim, Sunggak; Do, Jung Yun; Lim, Kwang Min, Journal of the Chemical Society. Perkin transactions I, 1994, # 18, p. 2517 - 2518
作者:Kim, Sunggak、Do, Jung Yun、Lim, Kwang Min
DOI:——
日期:——
IQBAL, JAVED;KHAN, M. AMIN, SYNTH. COMMUN., 19,(1989) N-4, C. 515-521