abstract |
PURPOSE: Pyridopyrimidine derivatives I [R 1 is lower alkyl; R 2 is lower a alkyl-mercapto, or - NR'R'' (R' and R'' are lower alkyl, or may bond together to form 4-5C alkylene or 4C alkylene containing one hetero atom)]; e.g. 2methylmercapto-8-ethyl-6-formyl-5,8-dihydro-5-oxopyrido [2,3-d] pyrimidine. n COPYRIGHT: (C)1977,JPO&Japio |