A stereoselective synthesis of a stable prostacyclin analogue ; dl-3-Oxa-9(O)-methano-.DELTA.6(9.ALPHA.)-prostaglandin I1.

Abstract
A prostacyclin analogue, dl-3-oxa-9(O)-methano-.DELTA.6(9.alpha.)-prostaglandin I1 (1a), has been synthesized. The key step for this synthesis is a new, one-step conversion reaction of the (hydroxy-methyl)cyclopropylketone group in 8 and 21 to the .gamma.,.delta.-unsaturated ketone 9 and 22, respectively, with iodotrimethylsilane.