申请人:Kyowa Hakko Kogyo Co., Ltd.
公开号:US04716241A1
公开(公告)日:1987-12-29
Novel cyclopentane derivatives which are useful as an intermediate for the preparation of N-(L-aspartyl)-N'-(2,2,5,5-tetramethylcyclopentanecarbonyl)-R-1,1-diaminoe thane are represented by the formula (I) ##STR1## wherein R.sub.1 is hydrogen and R.sub.2 is cyano, formyl, carbamoyl, alkanesulfonyloxy, or ##STR2## wherein R.sub.3 and R.sub.4 are the same or different and represent alkyl, substituted alkyl or R.sub.1 and R.sub.2 are combined to be methylsulfinylmethylene, acetoxymethylthiomethylene, halomethylthiomethylene, methylthiomethylene, alkoxy-methylene, or --CH.sub.2 --O--.
具有用作N-(L-天冬氨酰)-N'-(2,2,5,5-四甲基环戊烷羰基)-R-1,1-二氨基乙烷制备的中间体的新型环戊烷衍生物由式(I)表示:##STR1## 其中R.sub.1为氢,R.sub.2为氰基,甲酰基,氨基甲酰基,烷基磺酰氧基或##STR2## 其中R.sub.3和R.sub.4相同或不同,表示烷基,取代烷基或R.sub.1和R.sub.2结合成甲基亚砜亚甲基,乙酰氧甲硫亚甲基,卤代甲硫亚甲基,甲硫亚甲基,烷氧亚甲基或--CH.sub.2--O--。