2-Methyl-3-butyn-2-ol → 4,4-Difluoro-9-(3-hydroxy-3-methyl-but-1-ynyl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester

HRID 575114Notes

Reaction equation

[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]2[C:8]([F:21])([F:20])[CH2:9][O:10][C:11]3[CH:18]=[CH:17][C:16](Br)=[CH:15][C:12]=3[C:13]=2[N:14]=1)=[O:4].[CH3:22][C:23]([OH:27])([C:25]#[CH:26])[CH3:24].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>CCN(CC)CC.CC([O-])=O.CC([O-])=O.[Pd+2].[Cu]I>[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]2[C:8]([F:21])([F:20])[CH2:9][O:10][C:11]3[CH:18]=[CH:17][C:16]([C:26]#[C:25][C:23]([OH:27])([CH3:24])[CH3:22])=[CH:15][C:12]=3[C:13]=2[N:14]=1)=[O:4]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 9-Bromo-4,4-difluoro-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester as a yellow solid (166.5 mg, 0.443 mmol), 2-methyl-3-butyn-2-ol (298 mg, 3.544 mmol), Pd(OAc)2 (10 mg, 0.0443 mmol), CuI (17 mg, 0.0886 mmol) and PPh3 (35 mg, 0.1329 mmol) in Et3N (20 mL) was degassed with N2, and the mixture was stirred at 80° C. overnight. The reaction mixture was cooled to room temperature, concentrated and purified by flash column chromatography (silica gel, EtOAc in hexane from 0 to 40%) to give 4,4-Difluoro-9-(3-hydroxy-3-methyl-but-1-ynyl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester as a yellow solid (86 mg, 51%). LC-MS (ESI & APCI): 380.4 (M+1).

Workup

customwas degassed with N2
temperatureThe reaction mixture was cooled to room temperature
concentrationconcentrated
custompurified by flash column chromatography (silica gel, EtOAc in hexane from 0 to 40%)

Sources & evidence

ORD record: ord-4f0b52a4e16849b9bdebec4954598754
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09034866B2

Reaction notes

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