Synthesis of 4-Quinolones via Cyclocondensation of Substituted ortho-Amidoacetophenones: A Refit to the Camps Cyclization by Applying Trimethylsilyl Trifluoromethanesulfonate/Triethylamine
作者:Hans-Ulrich Reissig、Christian Eidamshaus、Therese Triemer
DOI:10.1055/s-0030-1260198
日期:2011.10
A modification of the classical Camps cyclization is described. A series of substituted 4-quinolone derivatives is prepared via trimethylsilyl trifluoromethanesulfonate/triethylamine induced cyclocondensation of substituted ortho-amidoacetophenones. The process shows a broad substrate scope and allows selective preparation of 2-aryl- and 2-alkyl-substituted 4-quinolones. Enantiopure starting materials react without loss of optical purity using the modified conditions. Subsequent transformations of the products involving preparation of a 4-quinolyl nonaflate and O-selective methylation are also described.
本文描述了一种经典Camps环化反应的改进方法。通过三甲基硅基三氟甲磺酸酯/三乙胺引发的取代邻氨基乙酰苯酮的环化缩合反应,制备了一系列取代的4-喹啉酮衍生物。该过程具有广泛的底物适用范围,并能选择性地制备2-芳基和2-烷基取代的4-喹啉酮。使用改进的条件,手性纯的起始材料反应后光学纯度无损失。还描述了产物的后续转化,包括制备4-喹啉基壬二酸盐和O-选择性甲基化反应。