Diphosgene → HCID 86718525, compound

To a solution of 2-amino-1-pyridin-3-yl-butan-1-ol (150 mg, 0.90 mmol) in CH2Cl2 (5 mL) was added under argon NEt3 (314 μL, 5.63 mmol) at 0° C. Then, diphosgene was added over a period of 5 minutes and the temperature was allowed to warm from 0° C. to room temperature within 2 hours. The reaction mixture was 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 heptane from 0% to 100% in order to give the title compound (100 mg, 58%) as a mixture of diastereoisomers A and B. LC-MS: [M+H] 193.1; Rt 0.43 min; (LCMS method 1). A) 1H NMR (400 MHz, CHCl3-d): 8.70-8.62 (m, 1H), 8.60-8.56 (m, 1H), 7.76-7.71 (m, 1H), 7.42-7.35 (m, 1H), 5.78 (d, 1H), 4.08-3.98 (m, 1H), 1.21-1.05 (m, 2H), 0.84 (t, 3H). B) 1H NMR (400 MHz, CHCl3-d): 8.70-8.62 (m, 2H), 7.80-7.76 (m, 1H), 7.42-7.35 (m, 1H), 5.21 (d, 1H), 3.75-3.68 (m, 1H), 1.89-1.69 (m, 2H), 1.05 (t, 3H).

1. temperatureto warm from 0° C. to room temperature within 2 hours
2. customThe reaction mixture was quenched with ice cold water
3. extractiona 2 M solution of Na2CO3, extracted with CH2Cl2
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by column chromatography

ORD record

ord-59e073a45d324027ba688daad53f9513

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09296733B2