* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
With hydrogenchloride; tin(II) chloride hydrate; acetic acid In water at 100℃; for 1 h;
Step 33.3: 3-methylbenzo[d]isoxazol-5-amine To a stirred solution of 3-methyl-5-nitrobenzo[d]isoxazole (Step 33.2) (1.8 g, 10.10 mmol) in AcOH (40 mL) was added a solution of tin(II) chloride dihydrate (6.84 g, 30.3 mmol) in HCl (15 mL, 494 mmol). The reaction mixture was stirred for 1 hr at 100° C., quenched with a saturated aq. NaHCO3 solution, diluted with water, and extracted with CH2Cl2. The combined organic layers were washed once with a saturated aq. NH4Cl solution, dried over Na2SO4 and evaporated. The crude material was purified by silica gel column chromatography (hexane/EtOAc 20-50) to afford the title product (458 mg, 3.09 mmol, 31percent yield) as a pink solid. tR: 0.50 min (LC-MS 2); ESI-MS: 149 [M+H]+ (LC-MS 2); Rf=0.45 (hexane/EtOAc 1:1).
31%
With tin(II) chloride dihdyrate In acetic acid at 100℃; for 1 h;
To a stirred solution of 3-methyl-5-nitrobenzo[d]isoxazole (Step 33.2) (1.8 g, 10.10 mmol) in AcOH (40 mL) was added a solution of tin(ll) chloride dihydrate (6.84 g, 30.3 mmol) in HCI (15mL, 494 mmol). The reaction mixture was stirred for 1 hr at 100 00 quenched with a saturated aq. NaHCO3 solution, diluted with water, and extracted with CH2CI2. The combined organic layers were washed once with a saturated aq. NH4CI solution, dried over Na2504 and evaporated. The crude material was purified by silica gel column chromatography (hexane/EtOAc 20-50) to afford the title product (458 mg, 3.09 mmol, 31 percent yield) as a pinksolid. tR. 0.50 mm (LC-MS 2); ESl-MS: 149 [M+H] (LC-MS 2); R= 0.45 (hexane/EtOAc 1:1).
With potassium hydroxide; In ethanol; dichloromethane;
EXAMPLE 24 Preparation of 3-Methyl-5-nitro-1,2-benzisoxazole A mixture of <strong>[23082-50-0]2'-chloro-5'-nitroacetophenone</strong>, oxime (30.0 g, 0.140 mol) in ethanol is treated dropwise with 10percent potassium hydroxide solution (7.86 g KOH), stirred at room temperature for one hour, refluxed overnight, cooled, and poured into water. The resultant aqueous mixture is filtered to obtain a solid. Column chromatography of the said using silica gel and methylene chloride gives the title product as a yellow solid (mp 84.5-86.5° C.) which is identified by NMR spectral analyses.
With potassium hydroxide; In ethanol; dichloromethane;
EXAMPLE 31 Preparation of 3-Methyl-5-nitro-1,2-benzisoxazole A mixture of <strong>[23082-50-0]2'-chloro-5'-nitroacetophenone</strong>, oxime (30.0 g, 0.140 mol) in ethanol is treated dropwise with 10percent potassium hydroxide solution (7.86 g KOH), stirred at room temperature for one hour, refluxed overnight, cooled, and poured into water. The resultant aqueous mixture is filtered to obtain a solid. Column chromatography of the solid using silica gel and methylene chloride gives the title product as a yellow solid (mp 84.5-86.5 °C) which is identified by NMR spectral analyses.
With hydrogenchloride; tin(II) chloride hydrate; acetic acid; In water; at 100.0℃; for 1h;
Step 33.3: 3-methylbenzo[d]isoxazol-5-amine To a stirred solution of 3-methyl-5-nitrobenzo[d]isoxazole (Step 33.2) (1.8 g, 10.10 mmol) in AcOH (40 mL) was added a solution of tin(II) chloride dihydrate (6.84 g, 30.3 mmol) in HCl (15 mL, 494 mmol). The reaction mixture was stirred for 1 hr at 100 C., quenched with a saturated aq. NaHCO3 solution, diluted with water, and extracted with CH2Cl2. The combined organic layers were washed once with a saturated aq. NH4Cl solution, dried over Na2SO4 and evaporated. The crude material was purified by silica gel column chromatography (hexane/EtOAc 20-50) to afford the title product (458 mg, 3.09 mmol, 31% yield) as a pink solid. tR: 0.50 min (LC-MS 2); ESI-MS: 149 [M+H]+ (LC-MS 2); Rf=0.45 (hexane/EtOAc 1:1).
31%
With tin(II) chloride dihdyrate; In acetic acid; at 100.0℃; for 1h;
To a stirred solution of 3-methyl-5-nitrobenzo[d]isoxazole (Step 33.2) (1.8 g, 10.10 mmol) in AcOH (40 mL) was added a solution of tin(ll) chloride dihydrate (6.84 g, 30.3 mmol) in HCI (15mL, 494 mmol). The reaction mixture was stirred for 1 hr at 100 00 quenched with a saturated aq. NaHCO3 solution, diluted with water, and extracted with CH2CI2. The combined organic layers were washed once with a saturated aq. NH4CI solution, dried over Na2504 and evaporated. The crude material was purified by silica gel column chromatography (hexane/EtOAc 20-50) to afford the title product (458 mg, 3.09 mmol, 31 % yield) as a pinksolid. tR. 0.50 mm (LC-MS 2); ESl-MS: 149 [M+H] (LC-MS 2); R= 0.45 (hexane/EtOAc 1:1).
Chemistry
Pharmaceutical Intermediates
Inhibitors/Agonists
Material Science
For Research Only
110K+ Compounds
Competitive Price
1-2 Day Shipping
