Reaction #815826

Reaction equation

4-chloroaniline

hydrochloric acid

sodium nitrite

(±)-cis-4-[(2-Amino-4-chloro-6-pyrimidinyl)amino]-2-cyclopentene-1-methanol

(+)-cis-4-[(2-Amino-4-chloro-6-pyrimidinyl)amino]-2-cyclopentene-1-methanol

sodium acetate trihydrate

→

title compound

(±)-cis-4-[[2-Amino-6-chloro-5-[(4-chlorophenyl)azo]-4-pyrimidinyl]-amino]-2-cyclopentene-1-methanol

4-chlorobenzenediazonium chloride

Solvents

water

acetic acid

Conditions

Workup

1. 1
   workup.ADDITIONTbis cold solution was added dropwise over 5 minutes to the first solution
2. 2
   FiltrationThe resulting yellow precipitate was filtered after 18 hours
3. 3
   Washwashed with water
4. 4
   Extractionextracted with ethanol

Procedure

(±)-cis-4-[(2-Amino-4-chloro-6-pyrimidinyl)amino]-2-cyclopentene-1-methanol from Example 1 (11.58 g, 48 1 mmol) and sodium acetate trihydrate (97 g) were dissolved in glacial acetic acid (225 mL) and water (225 mL). A cold solution (0.5° C.) of 4-chlorobenzenediazonium chloride was prepared from 4-chloroaniline (6.74 g, 52.8 mol), concentrated hydrochloric acid (14.7 mL) water (52 mL), and sodium nitrite (4.01 g, 58.2 mmol in 47 mL of water). Tbis cold solution was added dropwise over 5 minutes to the first solution. The resulting yellow precipitate was filtered after 18 hours, washed with water, and extracted with ethanol to give title compound as dark yellow powder (12.56 g, 69%), m.p. 218-220° C. dec.

Source