Carbonyl transposition on organoselenium compounds
作者:João V. Comasseto、Wai L. Lo、Nicola Petragnani
DOI:10.1016/s0040-4020(97)00454-7
日期:1997.6
Carbonyl conjugated vinylic selenides undergo 1,3 and 1,5-carbonyl transposition sequences through organometallic reagents addition reactions followed by acid hydrolysis.
羰基共轭乙烯基硒化物通过有机金属试剂加成反应进行1,3和1,5-羰基转座序列,然后进行酸水解。
Cyclic vinyl ether carbanions—II
作者:Robert K. Boeckman、Kenneth J. Bruza
DOI:10.1016/s0040-4020(01)93274-0
日期:——
Conditions for metalation of a variety of cyclic vinylethers and reaction of the resulting carbanions with electrophiles are described. Effects of the vinylether structure on the relative rates of metalation are discussed. Applications of this methodology to the construction of various types of carbonyl compounds are presented.
Application of the semi-pinacol rearrangement towards the generation of alkenyl-substituted quaternary carbon centres
作者:Timothy J. Snape
DOI:10.1039/b611912c
日期:——
The semi-pinacol rearrangement has been carried out on 2-methyl-2,3-epoxy-cyclopentanone derivatives, generating alkenyl-substituted quaternary carbon centred aldols with a defined relative stereochemistry.
A nickel-catalyzed highly regioselective 1,4-addition reaction of boronic acids to dienones to form products with an all-carbon quaternary center is described. The 3-alkenyl group of dienones is the key for the reaction to proceed smoothly. A mechanism involving the coordination of the dienyl group to the nickel center is proposed.
Regiodivergent 1,4 versus 1,6 Asymmetric Copper-Catalyzed Conjugate Addition