Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfur containing
Patent
1987-10-01
1989-01-03
Brust, Joseph Paul
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfur containing
568 38, 568 56, C07C14714, C07C14926
Patent
active
047958316
ABSTRACT:
Novel cyclopentane derivatives which are useful as an intermediate for the preparation of N-(L-aspartyl)-N'-(2,2,5,5-tetramethylcyclopetanecarbonyl)-R-1,1-diaminoet hane 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--.
REFERENCES:
patent: 2354230 (1944-07-01), Walter
patent: 2654667 (1953-10-01), Goodhue et al.
patent: 3052726 (1962-09-01), Middleton
patent: 3277181 (1966-10-01), Hechenbleikner et al.
patent: 3639485 (1972-02-01), Nast et al.
Hattori Kaneaki
Ikeda Shun-ichi
Tamaki Kentaro
Yamauchi Takayoshi
Brust Joseph Paul
Kyowa Hakko Kogyo Co. Ltd.
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