Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
Process for preparing optically active hydantoins
 Hydantoin derivatives and salts thereof, intermediates therefor, process for the preparation thereof, and medicines containing the derivatives, wherein said derivatives have the formula ##STR1## wherein one of V and W is hydrogen and the other is a halogenomethyl group, 1H-tetrazol-5-yl radical, --COOR group, PA2 in which R is hydrogen atom, an alkyl group, --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n is an integer of 1 to 113) or substituted phenyl, ##STR2## group, in which R.sub.1 and R.sub.2 are same or different independently, each is hydrogen atom, an alkyl group, substituted phenyl or --(CH.sub.2 CH.sub.2 O)nCH.sub.3 group (n has the meaning as referred to) or R.sub.1 may form a heterocyclic ring together with R.sub.2 and nitrogen or oxygen atom, --CH.sub.2 OR.sub.3 group or ##STR3## group, in which R.sub.3 and R.sub.4 are same or different independently and each is hydrogen atom or an alkyl group, PA1 X is oxygen or sulfur atom, and Y and Z are same or different independently and each is hydrogen atom, a halogen atom, alkyl group, alkoxy group, alkylmercapto group, nitro radical or --NHR.sub.5 group, in which R.sub.5 is hydrogen atom or an acyl group. The derivatives and salts thereof are useful for the treatment of complications of diabetes. 
Sanwa Kagaku Kenkyyusho Co., Ltd.
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inventional inventional inventional
Kenji Toshinao Yasuaki Kuniharu Noriaki Kiichi Masayasu Takuji Akira Kyoichi Naofumi
Miura Usui Kondo Mizuno Kato Sawai Kurono Yamaguchi Matsubara Asano Terada