It′s the iodine: The intra‐ and intermolecular title reaction is catalyzed by an in situgenerated ammonium (hypo)iodite species. Either H2O2 or tert‐butyl hydroperoxide (TBHP) can be used as an environmentally benign oxidant and a wide range of substrates react to give the corresponding α‐acyloxycarbonyl compounds in good to excellent yields.
它是碘:分子内和分子间标题反应是由原位生成的亚碘铵(次同)催化的。H 2 O 2或叔丁基氢过氧化物(TBHP)都可以用作环境友好的氧化剂,并且多种底物反应生成相应的α-酰氧基羰基化合物,收率良好至优异。
Enantioselective Bromolactonization of Deactivated Olefinic Acids
A novel enantioselectivebromolactonization of α,β-unsaturated ketones using bifunctional amino-urea catalysts has been developed. The scope of the reaction is evidenced by 23 examples of halolactones bearing various functionalities with up to 99% yield and 99:1 er. Unlike typical urea catalysts that require electron-deficient substituents to enhance the hydrogen bond strength, it is interesting to
Hypervalent iodine-catalyzed oxylactonization of ketocarboxylic acids to ketolactones
作者:Muhammet Uyanik、Takeshi Yasui、Kazuaki Ishihara
DOI:10.1016/j.bmcl.2009.03.148
日期:2009.7
The hypervalent iodine-catalyzed oxylactonization of ketocarboxylic acids to ketolactones was achieved in the presence of iodobenzene (10 mol %), p-toluenesulfonic acid monohydrate (20 mol %) and meta-chloroperbenzoic acid as a stoichiometric co-oxidant. (C) 2009 Elsevier Ltd. All rights reserved.
WIVERG K. V.; ODONNELL M. J., J. AMER. CHEM. SOC., 1979, 101, NO 22, 6660-6666
作者:WIVERG K. V.、 ODONNELL M. J.
DOI:——
日期:——
UTERMOEHLEN, CLIFFORD M.;SINGH, MAHATAM;LEHR, ROLAND E., J. ORG. CHEM., 52,(1987) N 25, 5574-5582
作者:UTERMOEHLEN, CLIFFORD M.、SINGH, MAHATAM、LEHR, ROLAND E.