Controlled Access to Furanose Precursors Related to Sesquiterpene Lactones. 1

Article abstract of DOI:10.1021/jo00350a062

The diester 4a which is readily obtained from "diacetone glucose" (1) undergoes Dieckmann cyclization to give the two possible β-keto esters, 5 and 6, in a ratio of 8:1.The carbonyl and esters groups on the cyclohexane ring of the major isomer are process