New heterocyclic ring systems. XII. Synthesis of [1,4]thiazinocarbazoles

Abstract

Five [1,4]thiazinocarbazoles have been synthesized from 6‐, 7‐ and 8‐amino‐2H[1,4]benzo‐thiazin‐3(4H)ones by the Jaap‐Klingemann reaction with 2‐hydroxymethylenecyclohexanone followed by Fischer indolisation of the resulting hydrazones. The structures of the hitherto unknown ring systems have been confirmed by pmr spectral data.