STEREOSELECTIVE SYNTHESIS OF TRANS-HYDROAZULENE DERIVATIVES BY TANDEMMICHAEL-INTRAMOLECULAR WITTIG REACTIONS OF A CYCLIC PHOSPHONIUM YLIDEWITH ALKYL OR ARYL 1-CYCLOPENTENYL KETONES
T. Fujimoto et al., STEREOSELECTIVE SYNTHESIS OF TRANS-HYDROAZULENE DERIVATIVES BY TANDEMMICHAEL-INTRAMOLECULAR WITTIG REACTIONS OF A CYCLIC PHOSPHONIUM YLIDEWITH ALKYL OR ARYL 1-CYCLOPENTENYL KETONES, Journal of organic chemistry, 58(26), 1993, pp. 7322-7323
The reaction of 1-cyclopentenyl ketones 4a-c with 1,1-diphenylphosphol
anium ylide 2 gave trans-hydroazulene derivatives 5a-c with high diast
ereoselectivity via tandem Michael-intramolecular Wittig reactions.