Method for preparation of 2-chloroacetoacetic acid amide and ester
The invention discloses a method for the preparation of 2-chloro acetoacetic acid amide or ester by a reaction of acetoacetic acid amide or ester with trichloroisocyanuric acid in the presence of amylene and in the solvent acetone.
1. A method for the preparation of a compound of formula (I)
by a reaction REAC1 of a compound of formula (II) with trichloroisocyanuric acid;
wherein
REAC1 is done in the presence of amylene;
REAC1 is done in the solvent acetone;
R1 is NH 2 , methoxy or ethoxy.
2. The method according to claim 1 , wherein
R1 is NH 2 .
3. The method according to claim 1 , wherein
in REAC1 the trichloroisocyanuric acid is charged to the compound of formula (II).
4. The method according to claim 1 , wherein one portion of the amylene is used for REAC1 in form of a mixture of amylene with trichloroisocyanuric acid, and the remaining portion of the amylene is used for REAC1 in form of a mixture of amylene with the compound of formula (II).
5. The method according to claim 4 , wherein
in REAC1 the mixture of amylene with trichloroisocyanuric acid is charged to the mixture of amylene with the compound of formula (II).
6. The method according to claim 4 , wherein
the mixture of amylene with trichloroisocyanuric acid is prepared by charging the amylene to the trichloroisocyanuric acid.
7. The method according to claim 4 , wherein the mixture of amylene with trichloroisocyanuric acid is used in form of a solution in acetone; and the mixture of amylene with compound of formula (II) is in form of a solution in acetone.
8. The method according to claim 7 , wherein
the trichloroisocyanuric acid is used for the preparation of the mixture of amylene with trichloroisocyanuric acid in the form of a solution of trichloroisocyanuric acid in acetone.
9. The method according to claim 7 , wherein
the part of the amylene, that is used for the preparation of the mixture of amylene with trichloroisocyanuric acid, is used for the preparation of the mixture in form of a solution of amylene in acetone.
10. The method according to claim 7 , wherein
the solution in acetone of the mixture of amylene with trichlorocyanuric acid is prepared by charging a solution of amylene in acetone to a solution of trichloroisocyanuric acid in acetone.
11. The method according to claim 1 , wherein cyanuric acid, that is formed in REAC1 as a by product, is separated from the reaction mixture after REAC1.
12. The method according to claim 11 , wherein
cyanuric acid, that is formed in REAC1 as a by-product, is separated from the reaction mixture after REAC1 by filtration.
13. The method according to claim 11 , wherein the solvent acetone of the reaction mixture is exchanged after REAC1 with dichloroethane.
14. The method according to claim 13 , wherein
the exchange of acetone with dichloroethane is done after the separation of cyanuric acid from the reaction mixture.
15. The method according to claim 13 , wherein the compound of formula (I) is isolated by crystallization from dichloroethane.