| titleOfInvention |
Preparation of 1,2,3,4,10,14b-hexahydro-dibenzo(c,f)-pyrazino(1,2-a)azepines and 1,2,3,4,10,14b-dibenzo-(c,f)-pyrimidino(3,4-a)-azepines |
| abstract |
1498632 Dibenzo[c,f]pyrazino[1,2-a]azepines and dibenzo[c,f]pyrimidino[3,4-a]azepines AKZO NV 28 Jan 1975 [9 Feb 1974] 3670/75 Heading C2C Compounds I or salts thereof in which R 1 and R 2 are H, OH, Hal, C 1-4 alkyl, C 1-4 alkoxy or CF 7 ; R 3 is H, C 1-6 alkyl, C 7-10 aralkyl or amino C 1-6 alkyl (in which the amino group is di-C 1-4 alkylated or represents a 5- or 6-membered heterocyclic ring); and m is 1 and n is 2 or m is 2 and n is 1; are prepared by ring closure in the presence of an acid of a compound III or a salt thereof in which X is Hal, etherified hydroxy or acyloxy. |