| abstract |
Benzo(1,3)dioxin-4-one derivs. of formula (I) are new: A = opt. substd. phenyl or heteroaryl; B = alkylene (opt. substd. by 1-3 alkyl, halo or alkoxy) or cycloalkylene (opt. substd. by 1-3 alkyl); Y = O or S; R<1>, R<2> = H, alkyl, or phenyl opt. substd. by 1-3 halo, alkyl or alkoxy; R<3> = halo, NO2, alkyl or alkoxy. |