作者:Brian S.J. Blagg、Dale L. Boger
DOI:10.1016/s0040-4020(02)00633-6
日期:2002.8
dihydroxylation reaction on the methyl vinyl ether 12, using the 3,4,5-trimethoxyphenyl-derived pyrimidine DHQ dimer ligand 16. In a single reaction vessel, the C and E rings were closed using an acid-catalyzed deprotection of the benzylic ethers to afford the corresponding benzylic bromides (18) which underwent intramolecular nucleophilic displacement by the carboxylate and pyridone nitrogen to furnish
描述了(+)-喜树碱的全合成。该方法基于室温LUMO二烯控制的缺电子的N-磺酰基-1-氮杂-1,3-丁二烯6与富电子的亲二烯体1,1,3,3-四乙氧基丙烯的Diels-Alder环加成反应(7),用于将吡啶前体组装到D环吡啶酮上。使用3,4,5-三甲氧基苯基衍生的嘧啶DHQ二聚体配体16通过Sharpless不对称二羟基化反应将20(S)叔醇安装在甲基乙烯基醚12上。。在单个反应容器中,使用酸催化的苄基醚脱保护作用封闭C和E环,得到相应的苄基溴化物(18),将其通过羧酸盐和吡啶酮氮进行分子内亲核置换,得到(+)-喜树碱。