Triethylamine → 6,6-Dimethyl-3-(5-(phenylethynyl)pyrazin-2-yl)-1,3-oxazinan-2-one

HRID 629255Notes

Reaction equation

[CH3:1][C:2]([OH:21])([CH2:4][CH2:5][NH:6][C:7]1[CH:12]=[N:11][C:10]([C:13]#[C:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)=[CH:9][N:8]=1)[CH3:3].C(N(CC)CC)C.Cl[C:30](Cl)([O:32]C(=O)OC(Cl)(Cl)Cl)Cl>C1COCC1>[CH3:3][C:2]1([CH3:1])[O:21][C:30](=[O:32])[N:6]([C:7]2[CH:12]=[N:11][C:10]([C:13]#[C:14][C:15]3[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=3)=[CH:9][N:8]=2)[CH2:5][CH2:4]1

Participants

Conditions

Temperature: 2.5 °C

Procedure

A solution of 2-methyl-4-(5-(phenylethynyl)pyrazin-2-ylamino)butan-2-ol (Example 168, step 2) (84 mg, 0.30 mmol) and triethylamine (91 mg, 125 μl, 0.90 mmol, 3 equiv.) in 2 ml of THF was cooled to 0-5° C. and triphosgene (89 mg, 0.30 mmol, 1 equiv.) was added in portions. The mixture was stirred for 1 hr at 0-5° C. and for 2 hours at room temperature. The reaction mixture was quenched with saturated sodium carbonate solution followed by workup with ethyl acetate/water. The organic layers were combined, dried and concentrated. The crude product was chromatographed over a prepacked 20 g Silica column eluting with a heptane to 50% ethyl acetate in heptane gradient to yield the title compound (66.1 mg, 72% yield) as an off-white solid, MS: m/e=308.3 (M+H+).

Workup

customThe reaction mixture was quenched with saturated sodium carbonate solution
customdried
concentrationconcentrated
customThe crude product was chromatographed over a prepacked 20 g Silica column
washeluting with a heptane to 50% ethyl acetate in heptane gradient

Sources & evidence

ORD record: ord-abc9882ebf9d4b9f80de42f38943c87f
Source dataset: uspto-grants-2016_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09315498B2

Reaction notes

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