Studies on Flavans. III. The Total Synthesis of (±)-7,4′-Dihydroxy-3′-methoxyflavan, (±)-7,3′-Dihydroxy-4′-methoxyflavan, and (±)-7,4′-Dihydroxyflavan
作者:Jijun Xue、Xianshu Zhang、Xuesong Chen、Yingpeng Zhang、Ying Li
DOI:10.1081/scc-120024733
日期:2003.10
The first total synthesis of (+/-)-7,3'-dihydroxy-4'-methoxyflavan (1) and (+/-)-7,4'-dihydroxy-3'-methoxyflavan (2), along with the synthesis of (+/-)-7,4'-dihydroxyflavan (3), three naturally occurring flavans, were described. The key step is the cyclization of 1,3-diaryl-1-propanol by (BF3Et2O)-Et-..