5-Bromopyridine-2,3-diamine → HCID 59243059, compound

Participants

Reaction Steps

Reaction of 3-(2-fluorobenzyloxy)-5-hydroxybenzoic acid (3.9 g, 15 mmole, 1.0 eq.) with 5-bromo-2,3-diaminopyridine (5.6 g, 30 mmole, 2 eq.), HBTU (11.3 g, 30 mmole, 2 eq.) and TEA (5.2 mL) in DMF (40 mL) over 18 h gave the amide intermediate (LC/MS calculated and found (M+2H+)=434 and 416 final product). This intermediate was isolated by pouring the reaction mixture into 400 g of ice water and filtering the subsequent white solid which formed. After the solid was thoroughly dried to 6.2 g, the material was brought through to the next step. The solid (2 g) was dissolved in 10 mL of ethyl alcohol and 10 mL of glacial acetic acid and put in the microwave at 180° C. for 30 min. This was repeated two more times to bring all 6.2 g through to the final product. This product crashed out of solution and was isolated as a brown solid after cooling the mixture to 0° C. for 10 h. The light tan solid (5.6 g) had an LC/MS with a calculated and found (M+H+)=416.

Provenance & Evidence