Cyclopentane derivatives
AssigneeKyowa Hakko Kogyo Co., Ltd.
InventorsTakayoshi Yamauchi, Kaneaki Hattori, Shunichi Ikeda, Kentaro Tamaki
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Abstract
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, alkoxymethylene, or --CH.sub.2 --O--.
Claims3
A compound represented by the formula ##STR8## wherein R.sub.1 is hydrogen and R.sub.2 is ##STR9## wherein R.sub.3 and R.sub.4 are the same or different and are straight or branched C.sub.1-6 alkyl, straight or branched C.sub.1-6 alkyl, substituted with 1 to 3 alkoxy, hydroxy, chloro or bromo substituents, or R.sub.1 or R.sub.2 are combined to be acetoxymethylthiomethylene, straight or branched C.sub.1-6 alkoxymethylene, or --CH.sub.2 --O--.
Dependencies are inferred from the claim text.