6-tri- O -benzyl-2-deoxy- d -allono-1,5-lactone ( 5 ) with concomitant inversion of the azido group. Compound 5 was readily condensed with l -alanine benzyl ester to afford N -(2-azido-3,4,6-tri- O -benzyl-2-deoxy- d -allonoyl)- l -alanine benzyl ester ( 12 ) without any racemization of the l -alanine moiety.
摘要用甲基亚砜和
乙酸酐的混合物氧化2-
叠氮基-3,4,6-三-O-苄基-2-脱氧-d-阿托拉糖(4),得到2-
叠氮基-3,4,6-tri -O-苄基-2-脱氧-d-allono-1,
5-内酯(5),同时
叠氮基团被反转。化合物5易于与1-丙
氨酸苄基酯缩合,得到N-(2-
叠氮基3,4,6-三-O-苄基-2-脱氧-d-丙二酰基)-1-丙
氨酸苄基酯(12), 1-丙
氨酸部分的任何外消旋化。