Propargyl alcohol → N-(2-(3-hydroxyprop-1-ynyl)-4-methylphenyl)-6-(trifluoromethoxy)-3,4-dihydro-2H-benzo[b][1,4]oxazine-2-carboxamide

HRID 1465165Notes

Reaction equation

[CH2:1]([OH:4])[C:2]#[CH:3].Br[C:6]1[CH:11]=[C:10]([CH3:12])[CH:9]=[CH:8][C:7]=1[NH:13][C:14]([CH:16]1[CH2:21][NH:20][C:19]2[CH:22]=[C:23]([O:26][C:27]([F:30])([F:29])[F:28])[CH:24]=[CH:25][C:18]=2[O:17]1)=[O:15].C(N(CC)CC)C>CN(C=O)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu]I>[OH:4][CH2:1][C:2]#[C:3][C:6]1[CH:11]=[C:10]([CH3:12])[CH:9]=[CH:8][C:7]=1[NH:13][C:14]([CH:16]1[O:17][C:18]2[CH:25]=[CH:24][C:23]([O:26][C:27]([F:30])([F:28])[F:29])=[CH:22][C:19]=2[NH:20][CH2:21]1)=[O:15]

Participants

Conditions

Temperature: 75 °C

Procedure

Prop-2-yn-1-ol (195 mg, 202 μL, 3.48 mmol), N-(2-bromo-4-methyl-phenyl)-6-(trifluoromethoxy)-3,4-dihydro-2H-1,4-benzoxazine-2-carboxamide (300 mg, 0.69 mmol), PdCl2(PPh3)2 (122 mg, 0.17 mmol), CuI (19.88 mg, 0.10 mmol), and triethylamine (970 μL, 6.96 mmol) were combined in DMF (5 mL) and heated at 75° C. for 18 h. Purification by silica gel chromatography (0-50% ethyl acetate/hexanes) provided N-(2-(3-hydroxyprop-1-ynyl)-4-methylphenyl)-6-(trifluoromethoxy)-3,4-dihydro-2H-benzo[b][1,4]oxazine-2-carboxamide (204 mg, 72% yield). LC/MS m/z 407.4 [M+H]+.

Workup

customPurification by silica gel chromatography (0-50% ethyl acetate/hexanes)

Sources & evidence

ORD record: ord-42b2c66286e2400d9b5eb0e08e2cabc6
Source dataset: uspto-grants-2015_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08999976B2

Reaction notes

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