Asymmetric synthesis of (−)-chicanine using a highly regioselective intramolecular Mitsunobu reaction and revision of its absolute configuration
摘要:
First asymmetric synthesis of (-)-chicanine has been accomplished in 14 steps by employing the Evans asymmetric syn-selective aldol reaction, diastereoselective hydroboration and an regioselective, intramolecular Mitsunobu etherification. The absolute configuration of (+)- and ()-chicanine has been revised to 2R,3S,4R,5R and 2S,3R,4S,5S, respectively, through CD analysis. (C) 2011 Elsevier Ltd. All rights reserved.