4-Chlorotoluene → 4-(p-Tolyl)morpholine

Temperatur

100 °C

In a nitrogen-atmosphere glovebox, a microwave vial equipped with a magnetic stir bar was charged with sodium tert-butoxide (56.9 mg, 0.592 mmol, 1.5 equivalents), tris(dibenzylideneacetone)dipalladium(0) (Pd2dba3) (3.62 mg, 0.00395 mmol, 0.01 equivalents), phosphine ligand (0.00869 mmol, 0.022 equivalents) and dioxane (0.79 mL). To the slurry was added 4-chlorotoluene (47 μL, 0.395 mmol, 1 equivalents) and morpholine (42 μL, 0.474 mmol, 1.2 equivalents). The vial was sealed with a crimp top and stirred at 100° C. After 14 hours, the vial was removed from the heating block, cooled to room temperature and brought out of the glovebox. To assay the crude reaction, an aliquot (7 μL) was taken and diluted in acetonitrile (1.5 mL), then injected onto an HPLC instrument. For isolation purposes, the reaction solution was worked up by diluting with CH2Cl2 (2 mL) and filtering into a round-bottom flask. The vial was rinsed with CH2Cl2 (5 mL), followed by washing of the filter cake with CH2Cl2 (2 mL). The volatiles were removed on a rotary evaporator and the crude concentrate was purified by silica gel column chromatography (25 g silica gel, 85:15 heptane:ethyl acetate). The purified product was isolated as a beige solid. 1H NMR (400 MHz, CDCl3) δ ppm 7.10 (d, J=8.2 Hz, 1H), 6.88-6.81 (m, 2H), 3.87 (dd, J=5.7, 3.9 Hz, 4H), 3.15-3.09 (m, 4H), 2.29 (s, 3H).

1. customIn a nitrogen-atmosphere glovebox, a microwave vial equipped with a magnetic stir bar
2. customThe vial was sealed with a crimp top
3. customthe vial was removed from the heating block
4. temperaturecooled to room temperature
5. customreaction
6. filtrationfiltering into a round-bottom flask
7. washThe vial was rinsed with CH2Cl2 (5 mL)
8. washby washing of the filter cake with CH2Cl2 (2 mL)
9. customThe volatiles were removed on a rotary evaporator
10. concentrationthe crude concentrate
11. customwas purified by silica gel column chromatography (25 g silica gel, 85:15 heptane:ethyl acetate)
12. customThe purified product was isolated as a beige solid

ORD-Eintrag

ord-9178d555d8704e4ca505560b22e564b1

Quelldatensatz

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08975443B2