Reaction of diphenylketene with some cyclohexa-3,5-diene-1,2-cis-diol derivatives: conversion of chlorobenzene into optically active 2-oxabicyclo[2.2.2]octen-3-one
作者:Carlos A. Pittol、Stanley M. Roberts、Peter W. Sutton、Julian O. Williams
DOI:10.1039/c39940000803
日期:——
The dienes 11–15 react with diphenylketene to give mixtures of the corresponding [2 + 2]-adducts 16–20 and [4 + 2]-adducts 21–25: the isomers 19/24 were converted into the opticallyactive lactone 26 in two steps.
cis-3,5-Cyclohexadiene-1,2-diol derivatives: facial selectivity in their Diels–Alder reactions with ethylenic, acetylenic and azo dienophiles
作者:Sunny M. Ogbomo、D. Jean Burnell
DOI:10.1039/b607938e
日期:——
The Diels-Alderreactions of maleimide with the acetonide derivative (6a) of cis-3,5-cyclohexadiene-1,2-diol (1a) in various solvents showed facial selectivities ranging from 1 : 1 to 1 : 9. The same derivative 6a reacted in benzene with ethylenic dienophiles with generally modest facial selectivity, but acetylenic dienophiles added exclusively anti to the oxygen functions of 6a. Dimerization of cyclic