Patent ID: 6180797
Filing Date: 2001-01-30
Classification: C07D

Abstract:
A process for the preparation of a compound of formula I ##STR11##whereinR and R.sub.1 are each independently H or C.sub.1 -C.sub.4 alkyl;R.sub.2 and R.sub.3 are each independently H, C.sub.1 -C.sub.4 alkyl or R.sub.2 and R.sub.3 may be taken together with the atom to which they are attached to form a group C.dbd.NOR.sub.9 or C.dbd.O;R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each independently H or C.sub.1 -C.sub.4 alkyl; andm is 0 or 1which process comprises reacting a compound of formula II ##STR12##wherein Hal is Cl, Br or I and R, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 and m are as described hereinabove with a catalytic amount of a transition metal catalyst and at least two molar equivalents of ammonium formate in the presence of a polar solvent optionally at an elevated temperature.