It is available on sigma aldrich, so it is known (100 mg is around 100$ and maybe cheaper from other companies). Check reaxys to see a an appropriate procedure, however it is not a difficult one and you can try starting from Schiff base step.
By Feeman, James F. Ger. Offen. (1972), DE 2140278 A 19720309. (Language: German)
"Four H2O-sol., acid title dyes [I; M = Na or K; Q = p-O2NC6H4, 6-nitro-2-benzothiazolyl, p-(PhN:N)C6H4, or (2-methoxy-4-nitro-5-methylphenylazo)-2-methoxy-5-methylphenyl], which dye nylon and cellulose acetate fibers fast brown, red, or violet shades, were prepd. by azo coupling. Thus, coupling diazotized p-O2NC6H4NH2 with m-MeC6H4N(Et)(CH2)3SO3Na gave the dark red dye (I, M = Na, Q = p-O2NC6H4) [34931-13-0] red on cellulose acetate fibers."