Synthesis of the Salicylihalamide Core Structure from Epichlorohydrin- Laying the Foundation to Macrolactone Collections
作者:Christian Herb、Frank Dettner、Martin E. Maier
DOI:10.1002/ejoc.200400705
日期:2005.2
enynol 29 via an Evans aldol reaction of the derived aldehyde 22 with the pentenoyloxazolidinone 23 and conversion of the carboxyl to a methyl group after the aldol reaction. Mitsunobu esterification of the enynol 29 with the benzoic acid 5 gave rise to the ester 30 with two double bonds and one triple bond. After protection of the terminal triple bond with a TIPS group, the ring closing metathesis proceeded
从 (R)-表氯醇开始,两个连续的碳 - 碳键形成,一个与乙炔,另一个与氰化物,导致 3-羟基腈 20。该化合物通过衍生的 Evans aldol 反应进一步精制为烯醇 29醛 22 与戊烯酰恶唑烷酮 23 和羧基在羟醛反应后转化为甲基。烯醇29与苯甲酸5的Mitsunobu酯化产生具有两个双键和一个三键的酯30。在用 TIPS 基团保护末端三键后,闭环复分解反应以良好的产率进行。大环内酯 E-33 被转化为乙烯基碘 34 和含有水杨酰卤酰胺类似物 36 的吡啶。所述序列,表氯醇的双侧延伸似乎是生成仲醇的一般途径,仲醇可以进一步加工成功能化的大环内酯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)