تفاعل #2286338
ord-fe666c957aa14a2bbe96669f05457f11
معادلة التفاعل
المتفاعلات
الكواشف
المذيبات
ظروف التفاعل
المعالجة
- 1درجة الحرارةThe resulting mixture was heated to 95° C. for 2 h
- 2ترشيحAt this time, the reaction was filtered hot through a pad of celite
- 3غسيلwas washed with water and ethyl acetate
- 4تركيزThe filtrates were concentrated
- 5أخرىto remove the majority of organics
- 6workup.ADDITIONThe remaining solution was diluted with water (500 mL)
- 7استخلاصThe solution was extracted with ethyl acetate (3×200 mL)
- 8تجفيفThe combined organics were dried with magnesium sulfate
- 9ترشيحfiltered
- 10تركيزconcentrated under vacuum
- 11درجة الحرارةwas cooled in the freezer for 30 min
- 12أخرىThe solid that formed
- 13ترشيحwas collected by filtration
- 14غسيلwas washed with cold diethyl ether
الإجراء التجريبي
A mixture of dimethyl-thiocarbamic acid S-(2,6-dichloro-4-nitro-phenyl)ester (80) (1.6 g, 5.4 mmol) in glacial acetic acid (24 mL), 2-propanol (48 mL), and water (24 mL) heated to 50° C. was treated with iron powder (2.1 g, 37.8 mmol). The resulting mixture was heated to 95° C. for 2 h. At this time, the reaction was filtered hot through a pad of celite and was washed with water and ethyl acetate. The filtrates were concentrated to remove the majority of organics. The remaining solution was diluted with water (500 mL) and was then brought to pH=8 with a concentrated ammonium hydroxide solution. The solution was extracted with ethyl acetate (3×200 mL). The combined organics were dried with magnesium sulfate, filtered and concentrated under vacuum. The resulting residue was slurried with diethyl ether and was cooled in the freezer for 30 min. The solid that formed was collected by filtration and was washed with cold diethyl ether to afford dimethyl-thiocarbamic acid S-(4-amino-2,6-dichloro-phenyl)ester (81) (1.33 g, 93%) as a white solid; EI(+)-HRMS m/e calcd for C9H10Cl2N2OS (M+H)+ 264.9964, found 264.9964. Exact Mass=263.9891; Molecular weight=265.16