A fully continuous flow approachtowards asymmetric total synthesis of four natural tetrahydroprotoberberine alkaloids, was developed through a concise linear sequence involving four chemical transformations and three on-line work-up processes without any intermediate purification. The overall yields and enantioselectivities obtained in this novel integrated flow platform were up to 50 % and 92 %ee
Synthesis and antihyperglycemic evaluation of various protoberberine derivatives
作者:Xiaoli Bian、Langchong He、Guangde Yang
DOI:10.1016/j.bmcl.2005.11.045
日期:2006.3
Various berberine derivatives (2-17) were synthesized and their antihyperglycemic activities were evaluated in a model of beta-cell-membrane chromatography and a model of alloxan-induced diabetes mice. The results indicated that compounds 5 and 14 exhibited antihyperglycemic activity. Their structure-activity relationships were discussed. (C) 2005 Elsevier Ltd. All rights reserved.