Sun, Qing published the artcileFacile preparation of dihydro-1,4-benzothiazine derivatives via oxidative ring-expansion of 2-aminobenzothiazoles with olefins, COA of Formula: C7H5ClN2S, the publication is Chemical Communications (Cambridge, United Kingdom) (2022), 58(13), 2216-2219, database is CAplus and MEDLINE.
A concise and efficient approach to prepare dihydro-1,4-benzothiazine derivatives I (R1 = H, 7-Br, 5,7-difluoro, 5-OMe, etc.; R2 = Ph, naphthalen-2-yl, ethyloxidanyl, etc.; R3 = H, Me, Ph), Et 9-cyano-3,3a,9,9a-tetrahydro-2H-benzo[b]furo[2,3-e][1,4]thiazine-6-carboxylate and Et 10-cyano-4b,10,10a,11-tetrahydrobenzo[b]indeno[2,1-e][1,4]thiazine-7-carboxylate is described via oxidative ring-expansion of 2-aminobenzothiazoles II with olefins R2CH=CHR3 under metal-free conditions. This protocol is applicable for a wide range of readily accessible 2-aminobenzothiazoles II and olefins with moderate-to-good yields. The [4+2] heteroannulation between the intermediacy of oxidative ring-opening of 2-aminobenzothiazoles II and olefins is suggested to rationalize the formation of the product.
Chemical Communications (Cambridge, United Kingdom) published new progress about 95-24-9. 95-24-9 belongs to thiazole, auxiliary class Organic Pigment, name is 6-Chlorobenzothiazol-2-ylamine, and the molecular formula is C8H7ClO3, COA of Formula: C7H5ClN2S.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/thiazole,
Thiazole | chemical compound | Britannica