Process for preparing tetrazole-substituted anthranilamide derivatives and novel crystal polymorphs of these derivatives
View Patent ↗The present invention relates to a process for preparing tetrazole-substituted anthranilamide derivatives of the formula (I) in which R 1 , R 2 , R 3 , R 4 , R 5 and Z are each as defined in the description, and to a novel crystal polymorph of these derivatives and to the use thereof in agrochemical formulations.
1. A process for preparing a compound of formula (I), or a N-oxide or a salt thereof
in which
R 1 , R 3 are each independently C 1 -C 5 -alkyl,
R 2 is halogen
R 4 is hydrogen, chlorine, or cyano,
R 5 is (C 1 -C 3 )perfluoroalkyl,
Z is N,
said process comprising reacting an N-aryl- and N-hetaryl-substituted pyrazole of formula (II)
in which
R is C 1 -C 6 -alkyl, aryl(C 1 -C 6 )alkyl or aryl
and X is fluorine, chlorine, bromine, iodine, CH 3 SO 2 O, CF 3 SO 3 , or p-CH 3 —C 6 H 4 SO 3 , with a tetrazole of formula (III)
to give a pyrazolecarboxylic ester of formula (IV)
in which
the latter are optionally hydrolysed under acidic or basic conditions without preceding isolation to a pyrazolecarboxylic acid of formula (V)
and the latter are reacted with a compound of the formula (VI)
to give an anthranilamide of the formula (I)
2. Process for preparing a compound according to claim 1 , where
R 1 , R 3 are each independently methyl, ethyl or tert-butyl,
R 2 is fluorine or chlorine,
R 4 is chlorine or cyano,
R 5 is CF 3 or C 2 F 5 ,
Z is N.
3. Process for preparing a compound according to claim 1 , wherein R 5 is CF 3 .
4. Process for preparing a compound according to claim 1 , wherein R 2 is chlorine, R 3 is methyl and R 4 is cyano.
5. Process according to claim 1 , wherein the compound of formula (I) is a crystal polymorph of the formula (I-1)
6. The process according to claim 5 wherein said crystal polymorph is crystal polymorph B which comprises an x-ray powder diffractogram using Cu Kα radiation that has at least the following reflections:
2theta/°
5.7
6.4
11.4
17.6
18.9
21.1
23.2
23.4
23.5
25.2.
7. The process according to claim 6 , wherein the x-ray powder diffractogram thereof of crystal polymorph B using Cu Kα radiation has at least the following further reflections:
2theta/°
11.7
16.8
19.7
20.5
24.3
24.6
28.3.
8. The process according to claim 6 , wherein the x-ray powder diffractogram thereof of crystal polymorph using Cu Kα radiation corresponds essentially to the spectrum reproduced in FIG. 1 .
9. The process according to claim 6 , wherein said crystal polymorph B of the compound of the formula (I-1) has a Raman spectrum that has at least the following bands:
Band [cm −1 ]
2929
1386
882
636.
10. The process according to claim 6 , wherein said crystal polymorph B has a Raman spectrum that corresponds essentially to the spectrum reproduced in FIG. 4 .