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A new method for preparing urea compounds

A compound and urea technology, which is applied in the field of preparation of urea compounds, can solve the problems of easy oxidation, high toxicity, and troublesome operation, and achieve the effect of easy separation and purification, mild reaction conditions, and stable oxidation

Inactive Publication Date: 2016-08-24
CHENGDU LIKAI CHIRAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some disadvantages such as: (1) some amine compounds are not stable and easy to be oxidized; (2) phosgene and its substitutes are too toxic and cumbersome to operate, and their activity is too high to easily cause side effects. The reaction leads to low yield; (3) isocyanate compounds are sometimes difficult to prepare, and they are not easy to separate and purify; (4) carbamate compounds have disadvantages such as difficult preparation and low activity

Method used

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  • A new method for preparing urea compounds
  • A new method for preparing urea compounds
  • A new method for preparing urea compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: synthetic compound (I-a)

[0024]

[0025] In a rigid glass tube add 3-bromo-3-benzylindolin-2-one (II) (0.1 mmol, 30.2 mg), O-tosyl-N-benzyloxycarbonylhydroxylamine (III) (0.15 mmol, 48.2 mg), CsCO 3 (0.2 mmol, 38.6 mg), then 2 ml of dichloromethane was added, and the mixture was stirred at room temperature for 14 h. Then p-toluenesulfonic acid (0.25 mmol, 43.1 mg) was added, and the reaction mixture was stirred at room temperature for 8 h. After the reaction was complete, the solvent was evaporated to dryness under reduced pressure to obtain a crude product. The crude product was separated and purified by column chromatography to obtain compound I-a, a white solid, with a yield of 94%.

[0026] The proton spectrum, carbon spectrum and mass spectrum data of gained compound I-a are as follows:

[0027] 1 H NMR (DMSO-d 6 , 300 MHz), δ (ppm): 4.42 (s, 2H), 5.20 (s, 2H), 7.19-7.43 (m, 11H), 7.55-7.61 (m, 1H), 8.17-8.20 (m, 1H) , 8.35 (d, J = 7.8 H...

Embodiment 2

[0028] Embodiment two: synthetic compound (I-b)

[0029]

[0030] In a rigid glass tube add 3-bromo-3-(2-methylbenzyl)indolin-2-one (II) (0.1 mmol, 31.6 mg), O-tosyl-N-benzyl Oxycarbonyl Hydroxylamine (III) (0.15 mmol, 48.2 mg), K 2 CO 3 (0.2 mmol, 27.6 mg), then 2 ml of acetonitrile was added, and the mixture was stirred at room temperature for 16h. Then p-toluenesulfonic acid (0.25 mmol, 43.1 mg) was added, and the reaction mixture was further stirred at room temperature for 8 h. After the reaction was complete, the acetonitrile was evaporated to dryness under reduced pressure to obtain a crude product. The crude product was separated and purified by column chromatography to obtain compound I-b (white solid, yield 99%).

[0031] The proton spectrum, carbon spectrum and mass spectrum data of gained compound I-b are as follows:

[0032] 1 H NMR (DMSO-d 6 , 300 MHz), δ (ppm): 2.15 (s, 3H), 4.47 (s, 2H), 5.17(s, 2H), 7.15-7.18 (m, 4H), 7.24 (t, J = 7.8 Hz, 1H ), 7.34-...

Embodiment 3

[0033] Example 3: Synthesis of compound (I-c)

[0034]

[0035] In a rigid glass tube add 3-bromo-3-(3-methylbenzyl)indolin-2-one (II) (0.1 mmol, 31.6 mg), O-tosyl-N-benzyl Oxycarbonyl Hydroxylamine (III) (0.15 mmol, 48.2 mg), Et 3N (0.4 mmol, 40.4 mg), then 2 ml of toluene was added, and the mixture was stirred at room temperature for 30 h. Then p-toluenesulfonic acid (0.25 mmol, 43.1 mg) was added, and the reaction mixture was continued to stir at room temperature for 8 h. After the reaction was complete, the toluene was evaporated to dryness under reduced pressure to obtain a crude product. The crude product was separated and purified by column chromatography to obtain compound I-c (white solid, yield 92%).

[0036] The proton spectrum, carbon spectrum and mass spectrum data of obtained compound I-c are as follows:

[0037] 1 H NMR (DMSO-d 6 , 300 MHz), δ (ppm): 2.27 (s, 3H), 4.37 (s, 2H), 5.20(s, 2H), 7.04-7.06 (m, 3H), 7.18-7.23 (m, 2H), 7.34 -7.43 (m, 5H), 7.55...

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Abstract

The invention discloses a novel urea type compound preparation method, and belongs to the technical field of organic synthesis. 3-halogenate oxidation indole as shown in a structural formula II reacts with O-tosyl-N-carbobenzoxy-hydroxylamine as shown in a structural formula III for 10 to 30 hours at 0 DEG C to 100 DEG C in an organic solvent under the existence of alkali, then organic acid is added, the reaction is conducted continuously, after complete reaction is finished, the solvent is dried by distillation, separated and purified, and a product is obtained. By means of the method, utilization of poisonous phosgene and substitutes of the poisonous phosgene is avoided, and raw materials and intermediate products are stable and not prone to being oxidized; the intermediate products and end-products are easy to separate and purify; the operation is simple, the reaction condition is moderate, the reaction yield is high, and the yield can reach 92%.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a new method for preparing urea compounds. Background technique [0002] Derivatives of urea widely exist in nature and are widely used in the fields of medicine, agriculture, industry and light industry. For example: the compound Diuron (A) is used as a herbicide in agriculture, the urea compound (B) with a morpholine ring structure can be used to treat chronic myelogenous leukemia, and the substituted urea compound (C) has been proved is an effective HIV-1 protease inhibitor, and compound (D) is an inhibitor of tyrosine kinase receptor (RTK). Urea compounds can also be used as catalysts to catalyze organic reactions, and some urea compounds are also important intermediates in organic synthesis. Therefore, the development of new methods for synthesizing urea compounds will bring many conveniences to the fields of medicine, agriculture and industry. [0003] [0004] So far...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/18C07C275/60
Inventor 袁伟成左健周鸣强徐小英张晓梅
Owner CHENGDU LIKAI CHIRAL TECH
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