Enantioselective synthesis of (3R,6S,7R,18R,19S)-, (3R,6S,7R,18R,19R)-, and (3R,6S,7R,18S,19R)-Quassiols A. A comment on the stereochemistry of natural quassiol A
Asymmetric dihydroxylation of geranyl, neryl and trans, trans-farnesyl acetates
摘要:
The asymmetric dihydroxylation of geranyl acetate, neryl acetate and trans, trans -farnesyl acetate was studied using the new Sharpless' ligands (DHQD)2-PHAL and (DHQ)2-PHAL. High enantioselectivity was always observed. High positional selectivity for the 6,7-olefin was observed in the case of the monoterpene acetates.