Carba- d , l -allal- and - d , l -galactal-derived vinyl N -nosyl aziridines as useful tools for the synthesis of 4-deoxy-4-( N -nosylamino)-2,3-unsaturated-5 a -carbasugars
作者:Valeria Di Bussolo、Ileana Frau、Lucilla Favero、Vittorio Bordoni、Stefano Crotti、Gloria Uccello Barretta、Federica Balzano、Paolo Crotti
DOI:10.1016/j.tet.2017.09.031
日期:2017.11
The novel carba-d,l-allal- and carba-d,l-galactal-derived vinyl N-nosyl aziridines were prepared and the regio- and stereoselective behavior in opening reactions with O- and N-nucleophiles examined. The carbaglycosylating ability of the novel aziridines, as deduced by the amount of 1,4-addition products (1,4-regioselectivity) obtained in the acid-catalyzed methanolysis taken as a model reaction, is
新颖carba- d,升-allal-和carba- d,升-galactal衍生的乙烯基Ñ -nosyl氮丙啶来制备,并与开口反应中区域选择性和立体选择性的行为ö -和Ñ -nucleophiles检查。新型氮丙啶的羧化糖基化能力(通过在模型反应中作为酸反应的甲醇催化中获得的1,4-加成产物的量(1,4-区域选择性)推导)类似于或优于相应的carba- d,升-allal-和- d,升-半乳糖衍生的乙烯基环氧化物。在所有获得的1,2-和1,4-加成产物中,–(N -nosylamino)基团是区域选择性和立体选择性地引入1,2-或2,3-不饱和羧化糖的C(4)碳原子上的,容易对氨基环糖醇衍生物进行进一步的研究。相应的,对映体纯carba-的立体选择性合成d,升-allal-和- d,升-galactal衍生的乙烯基ñ -乙酰基吖丙啶也被描述。