Enantiospecific synthesis of 3-aza-6,8-dioxa-bicyclo[3.2.1]octane carboxylic acids from erythrose
作者:Andrea Trabocchi、Gloria Menchi、Massimo Rolla、Fabrizio Machetti、Ilaria Bucelli、Antonio Guarna
DOI:10.1016/s0040-4020(03)00773-7
日期:2003.7
1]octane-carboxylic acids belonging to 7-endo-BTAa sub-class of γ/δ amino acids is described. The novelty is the use of 2,3-O-isopropylidene-erythrose instead of meso-tartaric acid derivative, thus allowing us to perform an enantiospecific synthesis. Reductive amination of erythrolactol with aminoacetaldehyde diethylacetal or benzylamine, and subsequent acid cyclisation gave directly the amino alcohol scaffold
描述了合成对映体纯的3-氮杂-6,8-二氧杂双环[3.2.1]辛烷羧酸的新方法,该对映体属于γ/δ氨基酸的7-内-BTAa亚类。新颖之处在于使用2,3- O-异亚丙基-赤藓糖代替内消旋酒石酸衍生物,从而使我们能够进行对映体特异性合成。用氨基乙醛二乙缩醛或苄基胺对异戊内酯进行还原胺化,然后进行酸环化,直接得到氨基醇支架。保护氮作为氨基甲酸酯和最终的醇氧化,得到Fmoc-,Boc-和Cbz-氨基酸。新的合成路线应用于多克级,因此大大提高了对映纯7-内酯的合成-BTG和7-内-BTK氨基酸。