Multiple Component Approaches to C-Glycosyl β-Amino Acids by Complementary One-Pot Mannich-Type and Reformatsky-Type Reactions
作者:Alessandro Dondoni、Alessandro Massi、Simona Sabbatini
DOI:10.1002/chem.200500823
日期:2005.11.18
development of new methods for the preparation of C-glycosyl beta-amino acid libraries with chemical and stereochemical diversity levels was investigated and the results are described herein. Two complementary one-pot three-component Mannich-type and Reformatsky-type synthetic strategies have been developed for the construction of chiral 3-amino propanoate fragments (eventually bis-substituted at C-2) directly
研究了开发具有化学和立体化学多样性水平的C-糖基β-氨基酸文库的新方法,并在此描述了结果。已经开发了两种互补的一锅式三组分曼尼希型和Reformatsky型合成策略,用于构建直接与吡喃糖和呋喃糖的异头碳相连的手性3-氨基丙酸酯片段(最终在C-2处被双取代)。残留物。两种方法的第一步都涉及糖醛与对甲氧基苄胺的偶联,但是亲核试剂(ad(2)合成子当量)有所不同,随后依次添加:乙烯酮甲硅烷基缩醛(Mannich途径)或溴锌烯酸酯(Reformatsky途径) )。单独的C-糖基β-氨基酯以单个3R非对映异构体的形式被公平地分离至优异的收率(60-90%),其结构由NMR光谱学(Riguera规程)指定,并由X射线晶体学支持。提供了基于过渡态模型的观察到的立体化学结果的初步解释。还报道了通过更传统的Reformatsky路线合成α,α-二氟C-糖基β-氨基酸的初步研究。