<i>De Novo</i> Synthesis of <scp>l</scp>-Colitose and <scp>l</scp>-Rhodinose Building Blocks
作者:Oliviana Calin、Rajan Pragani、Peter H. Seeberger
DOI:10.1021/jo201883k
日期:2012.1.20
A divergent, practical, and efficient de novo synthesis of fully functionalized l-colitose (3,6-dideoxy-l-galactose), 2-epi-colitose (3,6-dideoxy-l-talose), and l-rhodinose (2,3,6-trideoxy-l-galactose) building blocks has been achieved using inexpensive, commercially available (S)-ethyl lactate as the starting material. The routes center around a diastereoselective Cram-chelated allylation that provides
的发散,实用,高效的从头完全官能化的合成升-colitose(3,6-二脱氧升半乳糖),2-外延-colitose(3,6-二脱氧升-talose)和升-rhodinose(使用廉价的,可商购的(S)-乳酸乙酯作为起始原料,已经获得了2,3,6-三甲氧基-1-半乳糖)结构单元。路线围绕非对映选择性Cram螯合的烯丙基化,提供了常见的均烯醇中间体。最终,这种常见中间体的氧化导致了三种单糖结构单元的合成。