Triphosgene → HCID 77401728, compound

A solution of 2-nitro-1-pyridin-3-yl-butan-1-ol (3.20 g, 17.6 mmol) in ethanol (90 mL) was purged with argon, and 200 mg of Raney-Nickel was added at room temperature. The reaction mixture was three times evacuated and refilled with hydrogen. The reaction was stirred for 16 hours under H2 at room temperature. Raney-Nickel was then filtered over Hyflo, and the Hyflo washed with EtOH. The filtrate was then concentrated in order to give 2-amino-1-pyridin-3-yl-propan-1-ol as a product (2.35 g, 88%), which was used in the next reaction step without purification. To a solution of 2-amino-1-pyridin-3-yl-propan-1-ol (700 mg, 4.60 mmol) in CH2Cl2 (20 mL) was added under argon Et3N (1.60 mL, 11.5 mmol) at 0° C., followed by triphosgene (819 mg, 2.76 mmol, dissolved in 5 mL of CH2Cl2). The reaction temperature was allowed to warm from 0° C. to room temperature within one hour. The reaction mixture was then quenched with ice cold water and a 2 M solution of Na2CO3, extracted with CH2Cl2, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography using EtOAc in hexane from 0% to 100% in order to give the product (160 mg, 20%). LC-MS: [M+H] 179.1; Rt 0.31 min; (LCMS method 1).

1. customwas used in the next reaction step without purification
2. temperatureto warm from 0° C. to room temperature within one hour
3. customThe reaction mixture was then quenched with ice cold water
4. extractiona 2 M solution of Na2CO3, extracted with CH2Cl2
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by column chromatography

ORD record

ord-217676ba437449dea805a4934d9f5aec

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09296733B2