Substituted iminoderivatives of dihydrobenzopyran and dihydrobenzothiopyran and process for their preparation

Abstract From the Canadian patent

The invention relates to substituted iminoderivatives of 4H-2,3dihydrobenzopyran and 4H-2,3-dihydrobenzothiopyran of formula I wherein X is -O- or -S-; each of R1, R2 and R3 being the same or different, is hydrogen C1-C10 alkyl or phenyl; or R1 and R2, taken together form a, C5-C7 cycloakyl ring; R4 is hydrogen or C1-C6 alkyl; R6 is -OR10 or -SR10 wherein R10 is hydrogen or C1-C6 alkyl; R5 is C1-C10 alkyl C2-C10 alkenyl or, C3-C7 cycloalkyl, wherein the alkyl alkenyl and cycloalkyl groups are, unsubstituted or substituted by one or more substituents chosen from the group consisting of halogen, oxo, -OR10, -SR10 -COR10, -OCOR10, -COOR10 and, wherein each of the groups R10 being the same or …