| abstract |
The present invention relates to compounds of formula ( I ). (I) In this formula, R 1 , R 2 , R 3 and R 4 are each independently - (C 1 -C 12 ) -alkyl, - (C 3 -C 12 ) -cycloalkyl, - (C 3 -C 12 ) -heterocycloalkyl - (C 6 -C 20 ) -aryl, - (C 3 -C 20 ) -heteroaryl; At least one of the radicals R 1 , R 2 , R 3 and R 4 is a - (C 6 -C 20 ) -heteroaryl radical having 6 or more ring atoms; Wherein R 1 , R 2 , R 3 and R 4 are - (C 1 -C 12 ) -alkyl, - (C 3 -C 12 ) -cycloalkyl, - (C 3 -C 12 ) -heterocycloalkyl, - C 6 -C 20) - aryl, - (C 3 -C 20) - heteroaryl, or - (C 6 -C 20) - If the heteroaryl group, all of which are each independently - (C 1 -C 12) - alkyl, - (C 3 -C 12) - cycloalkyl, - (C 3 -C 12) - heterocycloalkyl, -O- (C 1 -C 12) - alkyl, -O- (C 1 -C 12) - alkyl- (C 6 -C 20) - aryl, -O- (C 3 -C 12) - cycloalkyl, -S- (C 1 -C 12) - alkyl, -S- (C 3 -C 12) - cycloalkyl , -COO- (C 1 -C 12) - alkyl, -COO- (C 3 -C 12) - cycloalkyl, -CONH- (C 1 -C 12) - alkyl, -CONH- (C 3 -C 12 ) cycloalkyl, -CO- (C 1 -C 12) - alkyl, -CO- (C 3 -C 12) cycloalkyl, -N - [(C 1 -C 12) alkyl] 2, - ( C 6 -C 20) - aryl, - (C 6 -C 20) - aryl - (C 1 -C 12) - alkyl, - (C 6 -C 20) - aryl -O- (C 1 -C 12) -alkyl, - (C 3 -C 20) - heteroaryl, - (C 3 -C 20) - heteroaryl, - (C 1 -C 12) -alkyl, - (C 3 -C 20) - heteroaryl, -O - (C 1 -C 12) - alkyl, -COOH, -OH, -SO 3 H , -NH 2, halogen coming Since it may be substituted by one or more substituents selected. The present invention further relates to precursors for the preparation of the compounds according to the invention, Pd complexes comprising the compounds according to the invention, and their use in alkoxycarbonylation. |