Gold(I)-Catalyzed Tandem Cyclization Approach to Tetracyclic Indolines
作者:Yongxiang Liu、Wenqing Xu、Xiang Wang
DOI:10.1021/ol100153h
日期:2010.4.2
Two highly stereoselective cationic gold(I)-catalyzedtandem cyclization reactions of alkynylindoles are described. These reactions demonstrated a novel and general strategy to rapidly construct highly functionalized polycyclic indolines. This approach was successfully employed for a formal synthesis of the akuammiline alkaloid minfiensine.
One-Pot Cascade Trifluoromethylation/Cyclization of Imides: Synthesis of α-Trifluoromethylated Amine Derivatives
作者:Vinay Kumar Pandey、Pazhamalai Anbarasan
DOI:10.1021/jo5002998
日期:2014.5.2
Tryptamine- and phenethylamine-derived imides were selectively monotrifluoromethylated using CF3TMS. Subsequent methanesulfonic acid mediated cyclization of the intermediate hemiaminals afforded the alpha-trifluoromethylated amine derivatives via the formation of trifluoromethylated acyliminium ions, in one pot. The strategy was applicable to the both inter- and intramolecular versions. Furthermore, the utility of the present method was demonstrated through the synthesis of trifluoromethylated analogues of harmicine and crispine A.
Mannich Biscyclizations. Total Synthesis of (-)-Ajmalicine
作者:Michael Loegers、Larry E. Overman、Gregory S. Welmaker