作者:Isabelle Berque、Patrick Le Ménez、Patrick Razon、Ange Pancrazi、Janick Ardisson、Jean-Daniel Brion
DOI:10.1055/s-1998-1873
日期:1998.10
In an approach to the C1-C9 eastern part 2 of tylonolide, aglycon of tylosin 1, an extension of the Hoppe reaction was, in a first key step, carried out between carbamate 6 and optically active aldehyde 5a and γ-lactol 5b. The latter gave the expected 7b adduct in 85% yield. After a homologation sequence, the C1-C7 fragment 14b was prepared and submitted to a second allylation reaction with crotyl N,N-diisopropyl carbamate to deliver compound 16 in 80% yield as a C1-C9 moiety of tylonolide.
在制备泰洛新 1 的缩醛泰洛内酯的 C1-C9 东部分 2 的过程中,在第一个关键步骤中,氨基甲酸酯 6 与光学活性醛 5a 和 δ-内酯 5b 之间进行了霍普反应的扩展。后者得到了预期的 7b 加合物,产率为 85%。经过同系化反应后,制备出 C1-C7 片段 14b,并与 N,N-二异丙基氨基甲酸巴豆酯进行第二次烯丙基化反应,得到化合物 16,C1-C9 塔罗内酯分子,收率为 80%。