Some common heterocyclic compound, 5900-59-4, name is 2-Amino-4-chlorobenzamide, molecular formula is C7H7ClN2O, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route. Safety of 2-Amino-4-chlorobenzamide
EXAMPLE 1 To a mixture of 7.73 g of 2-chloro-N-(3,4-dimetoxyphenethyl)acetamide, 5.12 g of 2-amino-4-chlorobenzamide, 13.5 g of sodium iodide and 3.63 g of magnesium oxide was added 30 ml of dimethylformamide and the resulting mixture was stirred at 90¡ã to 100¡ã C. for 4.5 hours. The reaction solution was concentrated under reduced pressure and the residue was extracted with 500 ml of chloroform. The chloroform extract was washed successively with 10percent hydrochloric acid, water, a 5percent aqueous sodium carbonate solution, a 5percent aqueous sodium sulfite solution and water, dried and then concentrated to dryness under reduced pressure. The residue was recrystallized from methanol to obtain 8.01 g of 2-(2-carbamoyl-5-chlorophenylamino)-N-(3,4-dimethoxyphenethyl)acetamide having a melting point of 167.5¡ã-168.5¡ã C. Elemental Analysis for C19 H22 O4 N3 Cl: Calcd. (percent): C, 58.24; H, 5.66; N, 10.72. Found (percent): C, 58.26; H, 5.59; N, 10.70.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5900-59-4, its application will become more common.
Reference:
Patent; Daiichi Seiyaku Co., Ltd.; US4297357; (1981); A;,
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