Trichloroacetonitrile → (+/-)-1-(5-Chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethyl 2,2,2-trichloroacetimidate

HRID 913831Notes

Reaction equation

[Cl:1][C:2]1[CH:10]=[C:9]([CH:11]([OH:13])[CH3:12])[C:8]2[C:4](=[CH:5][N:6]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:21])([CH3:20])[CH3:19])[N:7]=2)[CH:3]=1.N12CCCN=C1CCCCC2.[Cl:33][C:34]([Cl:38])([Cl:37])[C:35]#[N:36]>C(OCC)C>[Cl:33][C:34]([Cl:38])([Cl:37])[C:35](=[NH:36])[O:13][CH:11]([C:9]1[C:8]2[C:4](=[CH:5][N:6]([CH2:14][O:15][CH2:16][CH2:17][Si:18]([CH3:20])([CH3:19])[CH3:21])[N:7]=2)[CH:3]=[C:2]([Cl:1])[CH:10]=1)[CH3:12]

Participants

Conditions

Temperature: 0 °C

Procedure

(±)-1-(5-Chloro-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethanol (0.54 g, 1.65 mmol) was dissolved in diethyl ether (5 mL), cooled to 0° C. and treated with 1,8-diazabicyclo(5.4.0)undec-7-ene (50 μL, 0.33 mmol). The reaction was stirred for 10 min and treated with trichloroacetonitrile (250 μL, 2.48 mmol) dropwise over 10 min. The reaction was allowed to warm to room temperature overnight and concentrated. Flash chromatography on silica gel (5% ethyl acetate/hexanes) gave 600 mg (77%) as an oil. 1H-NMR (CDCl3, 300 MHz) δ 8.34 (s, 1H), 8.02 (s, 1H), 7.56 (d, J =1.5 Hz, 1H), 7.33 (m, 1H), 6.62 (q, J=6.2 Hz, 1H), 5.68 (s, 2H), 3.59-3.65 (m, 2H), 1.79 (m, 3H), 0.88-0.94 (m, 2H), 0.05 (s, 9H).

Workup

temperatureto warm to room temperature overnight
concentrationconcentrated
customFlash chromatography on silica gel (5% ethyl acetate/hexanes) gave 600 mg (77%) as an oil

Sources & evidence

ORD record: ord-f115e9bcdbfc4c25a53b768386b122d5
Source dataset: uspto-grants-2011_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08026257B2

Reaction notes

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