... Volume: Page: ... 19 Efficient enhancement was, however, not observed (entries 5 and 6). 20 A reagent 21 lacking the chiral ligand for the AD-mix ... Next, the best conditions explored for furan 6a (entry 3) were applied to 6b (Ar = Ph) and 6c (Ar = p-MeOC 6 H 4 ...