Patent ID: 6339084
Filing Date: 2002-01-15
Classification: C07D,C09B

Abstract:
A process of forming thiazine-indigo compounds of formula (I) (cis-isomers) and of formula (II) (trans-isomers) whereinR1 and R2 independently represent the atoms necessary to complete the formation of a substituted or unsubstituted aromatic or aliphatic carbocyclic or heterocyclic ring system, and R3 is hydrogen, C1-12alkyl or phenyl, comprising reacting in the presence of an aqueous system comprising water or water and a further component selected from the group consisting of acidic catalysts and basic catalysts; compounds of formulae (IIIa) and (IIIb) whereinR4 and Râ€²4 independently are H or a metallic ion selected from Na+, K+, or Zn2+with a compound of formula (IV) (bans isomers) or (V) (cis-isomers) whereinHal is Cl or Br, both R5 independently are a leaving group commonly used in substitution reactions at carbonyl carbon atoms.