反应 #3692383
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openreactiondata ↗doi:10.6084/m9.figshare.5104873.v1; patent:US06756360B1
反应条件: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.
实验步骤: A solution of 1-(2-methoxy-5-chlorophenyl)-2-thiourea (1 mmole) in chloroform (10 mL) was cooled to 10° C. and treated with bromine (2.2 mmole) in chloroform (10 mL). The reaction was stirred at 10° C. for 20 mm and at room temperature for 0.5 h. The resulting suspension was heated at reflux for 0.5 h. The precipitate was collected via filtration (washed with CH2Cl2) to give 2-amino-4-methoxy-7-chlorobenzothiazole which was subjected to Steps A, B, C and D of Example 34 to give 2-amino-4-phosphonomethoxy-6-bromo-7-chloro benzothiazole (35.1). mp >220° C. (dec.). Anal. Calcd. for C8H7N2O4PSCIBr: C:25.72; H: 1.89; N:7.50. Found: C:25.66; H:1.67; N:7.23. The resulting suspension was heated at reflux for 0.5 h The precipitate was collected via filtration (washed with CH2Cl2)
来源 ID: ord-d99371362075452183cbbd40f1c10054