Triethylamine → Isoquinoline

Temperatur

210 °C

To a solution of 3-methoxy cinnamic acid (11.04 g, 62 mmol) and triethylamine (12.52 g, 124 mmol) in acetone (80 mL) was added ethyl chloroformate (approximately 1.5 equivalents) dropwise at 0° C. After stirring at this temperature for 1 h, aqueous NaN3 (6.40 g, 100 mmol in 35 mL H2O; appropriate precautions must be taken when using sodium azide) 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), and dried to yield the desired product as a white solid (5.53 g, 51%) (Nicolas Briet et al, Tetrahedron, 2002, 5761–5766).

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-Eintrag

ord-24a862d483704196a72b061ba27d80e7

Quelldatensatz

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07173004B2