Isopropanol → HCID 66897681, compound

HRID 1188892Notes

Reaction equation

[OH:1][C:2]1[CH:3]=[C:4]([O:16][C:17]2[CH:22]=[CH:21][C:20]([S:23]([CH3:26])(=[O:25])=[O:24])=[CH:19][CH:18]=2)[CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:7]2.[CH2:27](P(CCCC)CCCC)[CH2:28][CH2:29]C.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O.CC(O)C>O1CCCC1>[CH3:27][CH:28]([O:1][C:2]1[CH:3]=[C:4]([O:16][C:17]2[CH:22]=[CH:21][C:20]([S:23]([CH3:26])(=[O:25])=[O:24])=[CH:19][CH:18]=2)[CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:7]2)[CH3:29]

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of ethyl 7-hydroxy-5-[4-(methylsulfonyl)phenoxy]-1H-indole-2-carboxylate (2.0 g), tributylphosphine (2.6 mL), 1,1′-(azodicarbonyl)dipiperidine (2.69 g), 2-propanol (0.81 mL) and tetrahydrofuran (50 mL) was stirred at 70° C. for 5.5 h. Furthermore, tributylphosphine (0.7 mL) and 1,1′-(azodicarbonyl)dipiperidine (0.7 g) were added to the mixture. After stirring at 70° C. for 2 h, the mixture was cooled to 0° C. and a precipitate was removed by filtration. The filtrate was concentrated and the residue was purified by basic silica gel column chromatography (ethyl acetate/hexane 1/99 to 40/60), followed by silica gel column chromatography (ethyl acetate/hexane=1/99 to 35/65, volume ratio) to give the title compound (1.87 g, 84%) as a white amorphous solid. MS 418 (MH+).

Workup

stirringAfter stirring at 70° C. for 2 h
temperaturethe mixture was cooled to 0° C.
customa precipitate was removed by filtration
concentrationThe filtrate was concentrated
customthe residue was purified by basic silica gel column chromatography (ethyl acetate/hexane 1/99 to 40/60)

Sources & evidence

ORD record: ord-7aca8a5decb042a7b2107222f774b651
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08673942B2

Reaction notes

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