The preparation and electrocyclic ring-opening of cyclobutenes: Stereocontrolled approaches to substituted conjugated dienes and trienes
作者:Falmai Binns、Roy Hayes、Kevin J. Hodgetts、Suthiweth T. Saengchantara、Timothy W. Wallace、Christopher J. Wallis
DOI:10.1016/0040-4020(96)00039-7
日期:1996.3
Thermal electrocyclic ring-opening of 4-alkyl-2-cyclobutene-1-carbaldehydes occurs at low temperature to give (2Z,4E)-alkadienals exclusively, and the process is exploited in transforming cis-3-cyclobutene-1,2-dimethanol 1 into a variety of naturally occurring 1,3,5-alkatrienes and 2,4-decadienoates. Desymmetrisation of 1 with Pseudomonas fluorescens lipase gives access to both enantiomers of 3-oxabicyclo[3
Stereoselective routes to functionalised hexa-2,4-dienals from cyclobutenes
作者:Stephen Ingham、Ralph W. Turner、Timothy W. Wallace
DOI:10.1039/c39850001664
日期:——
6-Substituted (2Z),(4E)- and (2E),(4E)-hexa-2,4-dienals have been prepared from a cyclobutene derivative via stereoselectiveelectrocyclic ring-opening and isomerisation processes.
Thermal electrorocyclic ring-opening of cyclobutenes: substituents with complementary conrotatory preferences induce high stereoselectivity
作者:Roy Hayes、Stephen Ingham、Suthiweth T. Saengchantara、Timothy W. Wallace
DOI:10.1016/0040-4039(91)80660-x
日期:1991.6
The thermal transformation of cis-disubstituted cyclobutenes into conjugated (Z,E)-dienes is stereoselective when the electronic and, to a lesser degree, steric effects of the substituents induce complementary conrotatory preferences at the reaction termini.