Enantioselective Synthesis of a Fluorinated Analogue of the Orsellinic Acid-Type Twelve-Membered Lactone Lasiodiplodin
摘要:
The chemoenzymatic synthesis of the racemate and the one enantiomer of the fluorinated analogue 8 of the natural cyclooxygenase inhibitor lasiodiplodin is decribed. A lipase-mediated deracemization of the fluorohydrin 18 provided the chiral, nonracemic building block for the enantioselective synthesis of the title compound. The key step was the formation of the 12-membered lactone by a ring-closing metathesis.
Enantioselective Synthesis of a Fluorinated Analogue of the Orsellinic Acid-Type Twelve-Membered Lactone Lasiodiplodin
摘要:
The chemoenzymatic synthesis of the racemate and the one enantiomer of the fluorinated analogue 8 of the natural cyclooxygenase inhibitor lasiodiplodin is decribed. A lipase-mediated deracemization of the fluorohydrin 18 provided the chiral, nonracemic building block for the enantioselective synthesis of the title compound. The key step was the formation of the 12-membered lactone by a ring-closing metathesis.
The combination of hydrogen fluoride salt and aluminium fluoride: an efficient solid reagent for epoxide opening to give fluorohydrins
作者:Junko Ichihara、Terukiyo Hanafusa
DOI:10.1039/c39890001848
日期:——
The combination of hydrogenfluoridesalt and porous aluminiumfluoride (MHF2–AlF3)(M = alkali metal) is a stable and efficientsolidreagent for promoting the ring-opening reaction of simple aliphatic oxiranes to give the fluorohydrins under sonication, as a substitute for anhydrous hydrogenfluoride.
Enantioselective ring-opening of epoxides by HF-reagents
作者:Günter Haufe、Stefan Bruns、Martina Runge
DOI:10.1016/s0022-1139(01)00486-9
日期:2001.11
The asymmetric ringopening of meso- and racemic-epoxides with different HF-reagents mediated by enantiopure (salen)chromium chloride provides optically active fluorohydrins with maximum 90% e.e. This reaction as well as lipase-catalyzed deracemization of a fluorohydrin is applied to synthesize a building block for the preparation of both enantiomers of a fluorinated analogue of the prostaglandin biosynthesis