| 摘要 |
The invention relates to an intermediate and a production thereof, said intermediate having the formula II <IMAGE> wherein R1 and R2, which may be equal or different, are hydrogen, lower alkyl, cycloalkyl, lower alkenyl, aralkyl or lower alkyl, which chain is broken by an oxygen atom or a group -N(R4)-, wherein R4 is hydrogen or lower alkyl, or R1 and R2 taken together with the nitrogen atom between them may form a heterocyclic ring, which may have another hetero atom, which is O or -N(R4)-; Alk is straight or branched alkylene chain with 1-6 carbon atoms, X is -CH2-, O or S; m is 2-4, n is 1 or 2, or if X = S or -CH2-, n is nought, 1 or 2 with the proviso that when X is O or -CH2- at least one of the groups R1 or R2 is other than hydrogen. |
