1,4-ASYMMETRIC INDUCTION IN THE FORMATION OF CYCLOHEXADIENONES BY CHIRALITY TRANSFER FROM A TRANSIENTLY INSTALLED CHROMIUM-STEREOSPECIFIC ELECTROCYCLIC RING-CLOSURE OF A METAL COMPLEXED VINYL KETENE
Rp. Hsung et al., 1,4-ASYMMETRIC INDUCTION IN THE FORMATION OF CYCLOHEXADIENONES BY CHIRALITY TRANSFER FROM A TRANSIENTLY INSTALLED CHROMIUM-STEREOSPECIFIC ELECTROCYCLIC RING-CLOSURE OF A METAL COMPLEXED VINYL KETENE, Chemical communications, (6), 1997, pp. 615-616
The cyclohexadienone annulation of a beta,beta-disubstituted vinyl chr
omium carbene complex and a chiral prop-2-ynylic ether results in high
1,4-asymmetric induction at the newly formed quaternary carbon; the s
tereochemical information from the prop-2-ynylic ether is initially tr
ansfered to the chromium coordination sphere and then to the quaternar
y carbon of the cyclohexa-2,4-dienone.