A One-Pot Tandem Ugi Multicomponent Reaction (MCR)/Click Reaction as an Efficient Protecting-Group-Free Route to 1H-1,2,3-Triazole-Modified α-Amino Acid Derivatives and Peptidomimetics
作者:Teng-Fei Niu、Chun Cai、Lan Yi
DOI:10.1002/hlca.201100253
日期:2012.1
catalyst systems for the click reaction were examined to find the optimal reaction conditions (Table 1, Scheme 1). Finally, an efficient Ugi MCR+Ugi MCR/click reaction strategy was elaborated in which two Ugi‐reaction products were coupled by a click reaction, thus incorporating the triazole fragment into the center of peptidomimetics (Scheme 3). Thus, the Ugi MCR/click reaction sequence is a convenient
通过不需保护基的单锅串联Ugi多组分反应(MCR)/点击反应序列,即可得到1 H 1,2,3-三唑改性的Ugi反应产物6a – 6n(方案1和表2),7a –成功合成了7b(表4)和8(方案2)。即,末端,侧链,或侧链和末端三唑修饰的Ugi反应产物作为肽合成的潜在氨基酸单位。检查了用于点击反应的不同催化剂体系以找到最佳反应条件(表1,方案1)。最后,阐述了一种有效的Ugi MCR + Ugi MCR /点击反应策略,其中通过点击反应将两个Ugi反应产物偶联,从而将三唑片段并入拟肽中心(方案3)。因此,Ugi MCR / click反应序列是一种简便而简单的方法,可用于处理不同的1 H -1,2,3-三唑修饰的氨基酸衍生物和拟肽。