Easy access to medium rings by entropy/strain reduction. Part 2. The ready availability of cis,cis-2,4-diene-1,6-diols and derived dibromides allows a simple and mild route to substituted 2,7-dihydro-1H-azepines
Efficient synthesis of unsaturated seven-membered rings by an entropy/strain reduction strategy: 2,7-dihydro-1H-azepines, -oxepines, -thiepines, -1H-phosphepine and 1,3-cycloheptadienes
Studies in the oxidative ring-opening of catechols and o-benzoquinones. Lead tetraacetate versus the copper(I) chloride/pyridine/methanol system
作者:James G Walsh、Patrick J Furlong、Louise A Byrne、Declan G Gilheany
DOI:10.1016/s0040-4020(99)00651-1
日期:1999.9
Lead tetraacetate oxidative ring-opening of a series of substituted catechols provides the corresponding substituted cis,cis-2,4-diene-1,6-dioates (1–10) in fair to good yields. A number of improvements on Wiessler's procedure for this reaction are reported. The analogous copper(I) chloride/pyridine/methanol ring-opening was found to be ineffective as a general synthetic method for this transformation