Diisopropylamine → 3-Ethynyl-6-methoxymethyl-pyridin-2-ylamine

Temperature

-78 °C

To a mixture of diisopropylamine (0.15 mL, 1.1 mmol) and tetrahydrofuran (2 mL) was added dropwise n-butyl lithium (1.6 M n-hexane solution, 0.68 mL, 1.1 mmol) at −78° C., which was stirred for 30 minutes at that temperature. Trimethysilyl diazomethane (2 M n-hexane solution, 0.50 mL, 0.99 mmol) was added to the reaction mixture at −78° C., and stirred for 30 minutes at that temperature. A mixture of 2-amino-6-methoxymethyl-pyridine-3-carbaldehyde (150 mg, 0.90 mmol) is described in Manufacturing Example 26-1-6 and tetrahydrofuran (1.5 mL) was added dropwise to the reaction mixture at −78° C., and stirred for 30 minutes at 0° C. The reaction mixture was cooled to −78° C., and a mixture of acetic acid (0.10 mL) and tetrahydrofuran (1 mL) was added dropwise to the reaction mixture. This reaction mixture was gradually warmed to 0° C., and partitioned into water and ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride, and the solvent was evaporated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:heptane=2:3) to obtain the title compound (73 mg, 50%).

1. stirringstirred for 30 minutes at that temperature
2. additionwas added dropwise to the reaction mixture at −78° C.
3. stirringstirred for 30 minutes at 0° C
4. additionwas added dropwise to the reaction mixture
5. temperatureThis reaction mixture was gradually warmed to 0° C.
6. custompartitioned into water and ethyl acetate
7. washThe organic layer was washed with saturated aqueous sodium chloride
8. customthe solvent was evaporated under a reduced pressure
9. customThe residue was purified by silica gel column chromatography (ethyl acetate:heptane=2:3)

ORD record

ord-5ccc3f141ddb49fba4f5d8299b4802c1

Source dataset

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08507530B2