Pyrrolo(1,2-b)-(1,2)-benzothiazin-10-one and its use as an antimicrobial
申请人:The Dow Chemical Company
公开号:US05270307A1
公开(公告)日:1993-12-14
Pyrrolo-(1,2-b)-(1,2)-benzothiazin-10-one is prepared which corresponds to the formula: ##STR1## This compound has been found to exhibit antimicrobial activity in industrial and commercial applications and compositions containing this compound are so employed.
Sulfenylation Using Sulfoxides. Intramolecular Cyclization of 2- and 3-Acylpyrroles
作者:Dallas K. Bates、Kelley A. Tafel
DOI:10.1021/jo00105a026
日期:1994.12
AlCl3-catalyzed acylation of N-(phenylsulfonyl)pyrrole with 2-(ethylthio)benzoyl chloride followed by hydrolysis provided 2-(2-(ethylthio)benzoyl)pyrrole (3). Compound 3 was also available from ethyl 2-(ethylthio)benzoate and pyrrolylmagnesium chloride (Scheme 2). Oxidation(NaIO4) gave the corresponding sulfoxide 4 which when refluxed 6 h inp-xylene (bp 138 degrees C) gave predominately the C-3 cyclization product 11 (51%) along with the rearrangement product 12 (17%). Conducting the thermal reaction in the presence of DMAP in refluxing toluene gave mainly the N-1 cyclization product 13 (46%) also accompanied by the rearrangement product 12 (20%). Formation of a 2H-pyrrole spirocyclic intermediate from thermally promoted intramolecular ipso-sulfenylation in 4 is suggested to account for the formation of 12. The N-methyl derivative of 4 (i.e. 6) produced 9 and 10 after 9 h at 138 degrees C; in the presence of DMAP only 9 is produced after 18 h at 138 degrees C. The 3-acyl sulfoxide 8 cyclized to 17 during 6.5 h at 138 degrees C. These results indicate that although sulfoxides are useful for intramolecular sulfenylation reactions, care must be taken in assigning structures to the product(s) because rearrangement may take place during and/or after the initial cyclization reaction. Addition of a basic amine to the reaction mixture may prevent acid-catalyzed rearrangements of the initially formed products.
DERIVES D'ACIDE 3,4-DIHYDRO-2H-1,2,4-BENZOTHIADIAZINE 1,1-DIOXYDE-3-CARBOXYLIQUE, LEUR PREPARATION ET LES MEDICAMENTS LES CONTENANT
申请人:RHONE-POULENC RORER S.A.
公开号:EP0636124A1
公开(公告)日:1995-02-01
PYRROLO(1,2-B)-(1,2)-BENZOTHIAZIN-10-ONE AND ITS USE AS AN ANTIMICROBIAL