| abstract |
Tetrahydropyrans of formula (I) or their salts are new. R1 = a gp. of formula (i) or (ii) ((i) with X6 = H or (ii) with X6 = Me, I or CH=CHBr); R2, R3 = H, PO3H2 or -C(O)-X7 (pref. H); X6 = F, Cl, Br, I, H, Me, CF3, Et, n-Pr, 2-fluoroethyl, 2-chloroethyl or trans-CH=CX9; X7 = H, aryl or opt. substd. alkyl; X9 = Cl, Br, I, H, Me or CF3; alkyl is 1-10C alkyl opt. substd. by 1 or more Cl, Br, F, I, NH2, azido, OH, CN, tri(1-6C)alkylammonium, 1-6C alkoxy, aryl or carboxy; aryl is phenyl opt. substd. by 1-3 of 1-6C alkyl, 1-6C alkoxy, Cl, Br, F, I, CF3, NH2, 1-6C mono- or dialkylamino, NO2, CN, 2-11C alkanoyloxy, COOH, carbamoyl or OH. |