Triethylamine → 6-methoxyisoquinolin-1(2H)-one

Temperature

210 °C

To a solution of 3-methoxy cinnamic acid (11.04 g, 62 mmol), triethylamine (12.52 g, 124 mmol) in acetone (80 mL) was added ethyl chloroformate dropwise at 0° C. After stirring at this temperature for 1 h, aqueous NaN3 (6.40 g, 100 mmol in 35 mL H2O) was added dropwise and the reaction mixture was stirred for 16 h at the ambient temperature. Water (100 mL) was added to the mixture and the volatile was removed in vacuo. The resulting slurry was extracted with toluene (3×50 mL) and the combined organic layers were dried over MgSO4. This dried solution was added dropwise to a heated solution of diphenylmethane (50 mL) and tributylamine (30 mL) at 190° C. The toluene was distilled off as added. After complete addition, the reaction temperature was raised to 210° C. for 2 h. After cooling, the precipitated product was collected by filtration, washed with hexane (2×50 mL), dried to yield a white solid (5.53 g, 51%), MS m/z 176 (M++H).

1. stirringthe reaction mixture was stirred for 16 h at the ambient temperature
2. customthe volatile was removed in vacuo
3. extractionThe resulting slurry was extracted with toluene (3×50 mL)
4. dry with materialthe combined organic layers were dried over MgSO4
5. additionThis dried solution was added dropwise to a heated solution of diphenylmethane (50 mL) and tributylamine (30 mL) at 190° C
6. distillationThe toluene was distilled off
7. additionas added
8. additionAfter complete addition
9. temperatureAfter cooling
10. filtrationthe precipitated product was collected by filtration
11. washwashed with hexane (2×50 mL)
12. customdried

ORD record

ord-46a368169eff4d7ba1c851f1474a7b4a

Source dataset

uspto-grants-2006_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07132504B2