Synthetic Studies toward Galbulimima Alkaloid (−)-GB 13 and (+)-GB 16 and (−)-Himgaline
作者:Weiwei Zi、Shouyun Yu、Dawei Ma
DOI:10.1002/asia.201000556
日期:2011.2.1
cleavage of the ketal protecting group. SmI2‐mediated carbonyl–alkene reductive coupling of 46 proceeded smoothly in refluxing tetrahydrofuran to deliver pentacyclic intermediate 49, which was oxidized with 2‐iodoxybenzoic acid and then treated with trifluoroacetic acid to furnish (−)‐GB 13. The overall yield was 6.1 % over 19 linear steps. By following the known procedure, our synthetic (−)‐GB 13 was converted