An Efficient Synthesis of 1-Allyl-1-Cyano-1-Alkenes and Related Structures
作者:Bernard MAUZÉ、Léone Miginiac
DOI:10.1080/00397919208019076
日期:1992.8
Abstract The one-pot synthesis of 1-allyl-1-cyano-1-alkenes is easily obtained from 1-allyl-1-trimethylsilylacetonitrile lithium and carbonyl derivatives via a silyl-Wittig-Peterson reaction. Other related compounds are prepared in the same manner.
Preparation of α-functionalized alkenylmagnesium reagents via a halide–magnesium exchange
作者:Jérôme Thibonnet、Viet Anh Vu、Laurent Bérillon、Paul Knochel
DOI:10.1016/s0040-4020(02)00439-8
日期:2002.6
A general preparation of alkenylmagnesium derivatives bearing an electron-withdrawing function in the alpha-position (Y=CN, CO2R, CONR2, SO2Ph) has been made possible by using a low temperature (-40 to -30degreesC) bromine-magnesium exchange with i-PrMgBr in THF. This reaction has also been used to prepare 5-magnesiated-1,3-dioxin-4-one derivatives bearing an alkoxy substituent in beta-position to the carbon-magnesium bond. (C) 2002 Published by Elsevier Science Ltd.
Chemo-, regio- and stereoselective addition of triorganoindium reagents to acetates of Baylis–Hillman adducts: a new strategy for the synthesis of (E)- and (Z)-trisubstituted alkenes
作者:Brindaban C. Ranu、Kalicharan Chattopadhyay、Ranjan Jana
DOI:10.1016/j.tetlet.2007.03.154
日期:2007.5
The addition of several trialkyl or triarylindium reagents to the acetates of Baylis–Hillmanadducts proceeds readily under the catalysis of copper and palladium derivatives. The reactions of trialkylindiums are catalyzed efficiently by CuI whereas additions of triarylindiums produce better results with Pd(PPh3)4. The reactions with 3-acetoxy-2-methylenealkanoates provide (E)-alkenes, whereas similar