Chiral delta-hydroxy-delta-ketoesters are easily available through the enantio selective vinylogous aldol reaction of Chan's diene promoted by a SiCl4/chiral phosphoramide catalytic system. The procedure is conveniently exploited for a very rapid approach to (+)-kavain, a natural bio-active alpha-pyrone compound. (c) 2007 Elsevier Ltd. All rights reserved.
A three-step total synthesis of goniothalesdiol A using a one-pot Sharpless epoxidation/regioselective epoxide ring-opening
作者:Perla Ramesh、Yarram Narasimha Reddy
DOI:10.1016/j.tetlet.2017.01.100
日期:2017.3
Using a one-pot Sharpless asymmetric epoxidation/regioselective epoxide ring-opening as a key step, the protecting-group-free totalsynthesis of goniothalesdiol A was accomplished in only three steps starting from commercially available trans-cinnamaldehyde in 55.1% overall yield. In 6 previously reported total syntheses, 6–11 steps were required.