Role of cations and confinement in asymmetric photochemistry: enantio- and diastereo-selective photocyclization of tropolone derivatives within zeolites
作者:Abraham Joy、Lakshmi S. Kaanumalle、V. Ramamurthy
DOI:10.1039/b504865f
日期:——
induction. Tropolone derivatives, upon irradiation undergo 4pi-electron electrocyclization to yield a bicyclic product and a rearranged product. Enantiomeric excess up to 68% has been achieved in the cyclized product. In systems where a chiral inductor has been covalently linked, diastereomeric excess as high as 88% has been achieved within a zeolite while the same system in solution gave 10%.
Cation–π interactions as a tool to enhance the power of a chiral auxiliary during asymmetric photoreactions within zeolites
作者:Lakshmi S. Kaanumalle、J. Sivaguru、N. Arunkumar、S. Karthikeyan、V. Ramamurthy
DOI:10.1039/b209810e
日期:——
Owing to the existence of cationâÏ interactions, aryl chiral auxiliaries perform far better than alkyl chiral auxiliaries during asymmetric photoreaction.