| 摘要 |
NEW MATERIAL:A compound expressed by formula I (X represents H or halogen atom; n is 2 or 3; m is 0-2). EXAMPLE:1,2,6-Trihydro-4H-pyrrole-[3,2,1-ij] [3,1]benzothiazin-4-one. USE:An agricultural and horticultural germicide, having superior germicidal activity especially on blast of rice plant and downy mildew of cucumber. PREPARATION:For example, a compound expressed by formula II (example; 1,4-dihydro-2H-3,1-benzothiazin-2-one, etc.) is reacted with a compound expressed by the formula Y(CH2)nY (Y represents halogen atom) (example; dichloroethane, etc.) in the presence of both a solvent and a base at 20-30 deg.C for 0.5-3hr to form a compound expressed by formula III [example; 1-(2-chloroethyl)1,4- dihydro-2H-3,1-benzothiazin-2-one, etc.]. The resultant product is reacted with a Lewis acid at 170-180 deg.C for 0.5-2hr to afford a compound expressed by formula IV.
|
