Synthesis and conformational and configurational studies of diastereoisomeric O-protected 4-(arylsulfonimidoyl)butane-1,2,3-triols
作者:Joey S.W. Kwong、Mary F. Mahon、Matthew D. Lloyd、Michael D. Threadgill
DOI:10.1016/j.tet.2007.10.017
日期:2007.12
S(±)-4-(benzyloxymethyl)-2,2-dimethyl-5-(arylsulfonimidoylmethyl)-1,3-dioxolanes. The configurations at sulfur were determined by X-ray crystallography and some analysis of the solution and solid-state conformations was carried out. The resulting O-protected 4-(arylsulfonimidoyl)butane-1,2,3-triols are of use in developing enzyme inhibitors.
手性亚砜肟类化合物可作为过渡态模拟酶抑制剂,肽等排体和合成中的手性助剂。为了获得所需的O保护的4-(芳基磺酰亚胺基)丁烷-1,2,3-三醇,4 S,5 S-二(羟甲基)-2,2-二甲基-1,3-二氧戊环(由二乙基R制备,将酒石酸R-酒石酸酯转化成其单苄基醚。与硫酚类的类似Mitsunobu的偶联产生4 S,5 R -4-(苄氧基甲基)-2,2-二甲基-5-(芳基硫甲基)-1,3-二氧戊环。进行硫氧化和S-胺化(三氟乙酰胺,碘代二苯碘乙酸酯,乙酸铑),没有立体选择性,得到不可分离的4 S非对映异构体混合物,5 R,S(±)-4-(苄氧基甲基)-2,2-二甲基-5-(N-(三氟乙酰基)芳基磺酰亚胺基甲基)-1,3-二氧戊环。去除三氟乙酰基保护使得非对映体4 S,5 R,S(±)-4-(苄氧基甲基)-2,2-二甲基-5-(芳基磺酰亚胺基甲基)-1,3-二氧戊环色谱分离。通过X射线晶体学确定硫的构