One-pot synthesis of 3-hydroxymaleic anhydrides by cyclization of 1,1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride
摘要:
Functionalized 3-hydroxymaleic anhydrides were prepared by cyclization of 1, 1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride. (c) 2007 Elsevier Ltd. All rights reserved.
Reactions of the α,β-unsaturated aldehyde 1 with the O-silyl ketene acetals 10 have been investigated. Both Michael addition and [4+2] cycloaddition products were formed, depending on the reaction conditions.
An approach to bufadienolides from deoxycholic acid-1
作者:Hans Wolfgang Hoppe、Manfred Kaiser、Dietrich Müller、Peter Welzel
DOI:10.1016/s0040-4020(01)86786-7
日期:1987.1
A direct synthesis of .beta.-hydroxybutyrolactones. Total synthesis of dendrolasin and formal total synthesis of aplysistatin
作者:George A. Kraus、Peter Gottschalk
DOI:10.1021/jo00174a038
日期:1983.12
Synthesis of trimethylsilyl carboxylates by HMDS under solvent-free conditions
作者:Marjan Jereb、Janja Lakner
DOI:10.1016/j.tet.2016.08.003
日期:2016.9
carboxylic acids were transformed into their trimethylsilyl esters with HMDS in a practically completely solvent-free process, while a catalytic amount of iodine was required in some cases. The process has several advantages over the known methods: untreated reactants, air atmosphere, mild and neutral conditions, no evolution of hydrogen halide, no need of an additional base, low amount of waste, completely
Functionalized 3-hydroxymaleic anhydrides were prepared by cyclization of 1, 1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride. (c) 2007 Elsevier Ltd. All rights reserved.