作者:Merritt B. Andrus、Ankush B. Argade
DOI:10.1016/0040-4039(96)01014-3
日期:1996.7
synthesized in a direct, and efficient manner. Lactone 1 was made using a substrate controlled lactonization reaction using the carbodiimide EDCI and two crotylborane additions were used to access the precursor hydroxyacid. The importance of proper substitution in the hydroxyacid tether is noted for successful medium-ring lactonization. Synthesis of the side chain vinyl iodide 2 employed an asymmetric allenylboronate
已经以直接,有效的方式合成了(+)-八-半乳糖苷A(一种有效的新的细胞毒性天然产物)的两个关键中间体。内酯1是通过使用碳二亚胺EDCI进行底物控制的内酯化反应制得的,并使用了两次巴豆基硼烷的加入来获得前体羟基酸。注意到在羟基酸系链中正确取代的重要性对于成功的中环内酯化是重要的。侧链乙烯基碘化物2的合成采用不对称的烯丙基硼酸酯加成。