Patent ID: 11912648
Assignee: EVONIK OPERATIONS GMBH
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing C—H acidic (meth)acrylates of formula (I):

CH2═CR1—CO—NH—R2—NH—CO—CH2—CN  (I)

(P)
wherein:
R1 is H or methyl;
R2 is CnHmOxNy;
wherein:
n=2-15;
m=4-30;
x=0-4; and
y=0-4;
wherein said method comprises:
a) reacting an ester of cyanoacetic acid (A) with a diamine (B) in excess;
b) removing unreacted diamine (B) from the reaction solution to obtain the intermediate product (IP), an amino-functionalized cyanoacetamide;
c) obtaining product (P) by reacting intermediate product (IP) obtained in step b) with either:
c1) (meth)acrylic acid esters (MAD); or
c2) (meth)acrylic anhydride (MAD) or (meth)acryloyl halide (MAD);
d) optionally isolating (P) by extraction or crystallization.