STEREOSELECTIVE SYNTHESIS OF ALCOHOLS .42. STEREOSELECTIVE CYCLIZATION OF (8-OXO-2-OCTENYL)BORONATES TO CIS-2-VINYLCYCLOHEXANOL OR TRANS-2-VINYLCYCLOHEXANOL
Rw. Hoffmann et al., STEREOSELECTIVE SYNTHESIS OF ALCOHOLS .42. STEREOSELECTIVE CYCLIZATION OF (8-OXO-2-OCTENYL)BORONATES TO CIS-2-VINYLCYCLOHEXANOL OR TRANS-2-VINYLCYCLOHEXANOL, Liebigs Annalen der Chemie, (7), 1993, pp. 771-775
Intramolecular allylboration reactions of (8-oxo-2-octenyl)boronates p
roceed with excellent diastereoselectivity: the E-isomer 1d leads to t
he trans-2-vinylcyclohexanol (2) with 99.5% d.s., the corresponding Z-
isomer 3d cyclizes to give the cis-isomer with a diastereoselectivity
exceeding 99.8%.