6,7-Dimethoxy-2-phenyl-4H-l,3-benzothiazine (la) was oxidized with hydrogen peroxide to yield [2,2'-bis(benzoyIaminomethyl)-4,4',5,5'-tetramethoxyldiphenyl disulfide (2). Potassium permanganate oxidation of Aa gave 6,7-dimethoxy-2-phenyl-4B-1,3benzothiazinll-one (5a), wKch was oxidized with the calc
Ring expansion of 2-chloromethylbenzothiazole: Synthesis of heteroarylalkylidene 1,4-benzothiazines
✍ Scribed by Saverio Florio; Luigino Troisi; Vito Capriati
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- French
- Weight
- 175 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4039
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## Abstract magnified image A new simple synthetic approach to 2,4‐difuryl‐4__H__‐3,1‐benzothiazines from 2‐isothiocyanoaryldifuryl‐methanes in the presence of acidic catalyst is described. This rearrangement is a new example of furan ring migration reaction resulting from intramolecular attack wi
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