2,6-Lutidine → N-(3-Chloro-4-fluorophenyl)-4-[(triisopropylsilyl)oxy]methyl-1,2,5-oxadiazole-3-carboxamide

HRID 2097606Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]([NH:9][C:10]([C:12]2[C:16]([CH2:17][OH:18])=[N:15][O:14][N:13]=2)=[O:11])[CH:5]=[CH:6][C:7]=1[F:8].N1C(C)=CC=CC=1C.O([Si:35]([CH:42]([CH3:44])[CH3:43])([CH:39]([CH3:41])[CH3:40])[CH:36]([CH3:38])[CH3:37])S(C(F)(F)F)(=O)=O>ClCCl>[Cl:1][C:2]1[CH:3]=[C:4]([NH:9][C:10]([C:12]2[C:16]([CH2:17][O:18][Si:35]([CH:42]([CH3:44])[CH3:43])([CH:39]([CH3:41])[CH3:40])[CH:36]([CH3:38])[CH3:37])=[N:15][O:14][N:13]=2)=[O:11])[CH:5]=[CH:6][C:7]=1[F:8]

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of N-(3-chloro-4-fluorophenyl)-4-(hydroxymethyl)-1,2,5-oxadiazole-3-carboxamide (3.2 g, 0.012 mol) in dichloromethane (DCM) (23 mL) at 0° C. was added 2,6-lutidine (3.4 mL, 0.029 mol) followed by triisopropylsilyl triflate (4.1 mL). The solution was stirred at 0° C. for 30 min and then the reaction was warmed to rt overnight. The reaction was concentrated and chromatographed on a silica column eluting with 15% ethyl acetate/hexane to yield a colorless oil (4.59 g, 91%). 1H NMR (400 MHz, DMSO-d6) δ: 11.03 (s, 1H), 8.01 (dd, J=6.7, 2.6 Hz, 1H), 7.67 (ddd, J=9.1, 4.3, 2.6 Hz, 1H), 7.44 (dd, J=9.1, 9.1 Hz, 1H), 5.2 (s, 2H), 1.09 (m, 3H), 0.99 (d, J=7.1 Hz, 18H); MF═C19H27ClFN3O3Si; LCMS calculated for C19H28ClFN3O3Si(M+H)+: m/z=428.157.

Workup

temperaturethe reaction was warmed to rt overnight
concentrationThe reaction was concentrated
customchromatographed on a silica column
washeluting with 15% ethyl acetate/hexane

Sources & evidence

ORD record: ord-fd82bdd64c3749a4afc2359b7d03d6d0
Source dataset: uspto-grants-2013_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08450351B2

Reaction notes

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