Trichloroacetonitrile → (+/-)-1-(3-Bromo-5-chloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indazol-7-yl)ethyl 2,2,2-trichloroacetimidate

HRID 913876Notes

Reaction equation

[Br:1][C:2]1[C:10]2[C:5](=[C:6]([CH:12]([OH:14])[CH3:13])[CH:7]=[C:8]([Cl:11])[CH:9]=2)[N:4]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20])[N:3]=1.N12CCCN=C1CCCCC2.[Cl:34][C:35]([Cl:39])([Cl:38])[C:36]#[N:37]>C(Cl)Cl>[Cl:34][C:35]([Cl:39])([Cl:38])[C:36](=[NH:37])[O:14][CH:12]([C:6]1[CH:7]=[C:8]([Cl:11])[CH:9]=[C:10]2[C:5]=1[N:4]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:21])([CH3:20])[CH3:22])[N:3]=[C:2]2[Br:1])[CH3:13]

Participants

Conditions

Temperature: 0 °C

Procedure

(±)-1-(3-Bromo-5-chloro-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indazol-7-yl)ethanol (1.29 g, 3.18 mmol) was dissolved in methylene chloride (10 mL), cooled to 0° C. and treated with 1,8-diazabicyclo(5.4.0)undec-7-ene (96 μL, 0.64 mmol). The reaction was stirred for 10 min and treated with trichloroacetonitrile (3.19 mL, 31.8 mmol) dropwise over 10 min. The ice bath was removed and the reaction stirred at room temperature for 1 h and concentrated. Flash chromatography on silica gel (5% ethyl acetate/hexanes) gave 1.69 g (77%) as an oil. 1H-NMR (CDCl3, 300 MHz) δ 8.27 (s, 1H), 7.59 (d, J=1.8 Hz, 1H), 7.53 (d, J=1.8 Hz, 1H), 6.58 (q, J=6.6 Hz, 1H), 6.19 (qAB, JAB=11.4 Hz, 2H), 3.50-3.56 (m, 2H), 1.74 (m, 3H), 0.80-0.84 (m, 2H), 0.06 (s, 9H).

Workup

customThe ice bath was removed
stirringthe reaction stirred at room temperature for 1 h
concentrationconcentrated
customFlash chromatography on silica gel (5% ethyl acetate/hexanes) gave 1.69 g (77%) as an oil

Sources & evidence

ORD record: ord-c5a6012a545d4b649faea66e0ca3d94d
Source dataset: uspto-grants-2011_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08026257B2

Reaction notes

Loading…