### Abstract

The ring-closure reactions of N-(3,4-dimethoxyphenylthiomethyl)-2-nitrobenzamide derivatives 5a,b with phosphoryl chloride gave 4-(2-nitrophenyl)-2H-1,3-benzothiazine derivatives 7a,b, which on reduction yielded 4-(2'-aminophenyl)-3,4-dihydro-2H-1,3-benzothiazines 8a,b. Reaction of these compounds with phosgene led to a new heterocyclic ring system, 6-H,8H-quinazolino[3,4-c][1,3]benzothiazine derivatives 9a,b. The structures of the title compounds were proved via their ir and nmr (^{1}H, ^{13}C) spectra.

Original language | English |
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Pages (from-to) | 1513-1517 |

Number of pages | 5 |

Journal | Mathematical Problems in Engineering |

Volume | 29 |

Issue number | 6 |

Publication status | Published - Oct 1 1992 |

### ASJC Scopus subject areas

- Mathematics(all)
- Engineering(all)

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## Cite this

Szabó, J., Bani-Akoto, E., Dombi, G., Bernáth, G., Fodor, L., & Sohár, P. (1992). Synthesis of quinazolino-1,3-benzothiazine derivatives.

*Mathematical Problems in Engineering*,*29*(6), 1513-1517.