反应详情

Step 1: This compound was prepared according to the procedure outlined in Intermediate 2, Step 1 using 5-chloro-1,3-thiazol-2-amine hydrochloride (3.01 g, 17.482 mmol) polyphosphoric acid (81.0 g) and ethyl chloroacetoacetate (4.03 g, 24.475 mmol) to afford 5.1 g of the desired compound as a brown solid: 1H NMR (300 MHz, DMSO-d6) δ 4.55 (s, 2H), 6.45 (s, 1H), 8.31 (s, 1H); ESI-MS (m/z) 235.57 (M+H)+.

1. customStep 1: This compound was prepared