Nucleophile-Catalyzed Additions to Activated Triple Bonds. Protection of Lactams, Imides, and Nucleosides with MocVinyl and Related Groups
作者:Laura Mola、Joan Font、Lluís Bosch、Joaquim Caner、Anna M. Costa、Gorka Etxebarría-Jardí、Oriol Pineda、David de Vicente、Jaume Vilarrasa
DOI:10.1021/jo4006409
日期:2013.6.21
Additions of lactams, imides, (S)-4-benzyl-1,3-oxazolidin-2-one, 2-pyridone, pyrimidine-2,4-diones (AZT derivatives), or inosines to the electron-deficient triple bonds of methyl propynoate, tert-butyl propynoate, 3-butyn-2-one, N-propynoylmorpholine, or N-methoxy-N-methylpropynamide in the presence of many potential catalysts were examined. DABCO and, second, DMAP appeared to be the best (highest
将内酰胺,酰亚胺,(S)-4-苄基-1,3-恶唑烷-2-酮,2-吡啶酮,嘧啶-2,4-二酮(AZT衍生物)或肌苷添加到在许多潜在催化剂的存在下,检查了丙酸甲酯,丙酸叔丁酯,3-丁炔-2-酮,N-丙酰基吗啉或N-甲氧基-N-甲基丙炔酰胺。DABCO和其次是DMAP似乎是最好的(最高的反应速率和E / Z比),而RuCl 3,RuClCp *(PPh 3)2,AuCl,AuCl(PPh 3),CuI和Cu 2(OTf)2个不能催化这种添加。并入的基团(例如,我们称为MocVinyl的2-(甲氧基羰基)乙烯基)用作上述杂环CONH或CONHCO部分的保护基。脱保护是通过与良好的亲核试剂进行交换来实现的:1-十二烷硫醇根阴离子被证明是最通用,最有效的试剂,但在某些特定情况下,其他亲核试剂也起作用(例如,MocVinyl-肌苷可被琥珀酰亚胺阴离子裂解)。DFT和MP2计算帮助解决了一些结构和机械细节。