Trityl chloride → methyl 1-trityl-1H-imidazole-4-carboxylate

HRID 720638Notes

Reaction equation

[CH3:1][O:2][C:3]([C:5]1[N:6]=[CH:7][NH:8][CH:9]=1)=[O:4].C(N(CC)CC)C.[C:17]1([C:23](Cl)([C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)[C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>CN(C)C=O>[CH3:1][O:2][C:3]([C:5]1[N:6]=[CH:7][N:8]([C:23]([C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)([C:30]2[CH:31]=[CH:32][CH:33]=[CH:34][CH:35]=2)[C:24]2[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=2)[CH:9]=1)=[O:4]

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of 1H-Imidazole-4-carboxylic acid methyl ester (1.0 g, 7.93 mmol) in N,N-dimethylformamide at 25° C. was treated with triethylamine (2.2 mL, 15.86 mmol) and triphenylmethylchloride (2.43 g, 8.72 mmol). The reaction was stirred at 25° C. for 8 h and then concentrated in vacuo. The residue was diluted with ethyl acetate and then washed with water, a 1N aqueous hydrochloric acid solution, water, and a saturated aqueous sodium chloride solution. The organics were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230–400 mesh, 50:50 ethyl acetate/petroleum ether) afforded 1-trityl-1H-imidazole-4-carboxylic acid methyl ester (2.88 g, 98.6%) as a white foam: 1H NMR (DMSO-d6, 300 MHz) δ7.56 (s, 1H), 7.47 (m, 10H), 7.09 (m, 6H), 3.69 (s, 3H).

Workup

concentrationconcentrated in vacuo
additionThe residue was diluted with ethyl acetate
washwashed with water
dry with materialThe organics were dried over magnesium sulfate
filtrationfiltered
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-4929b37ac1044b4fb3ad52b70cff5b3a
Source dataset: uspto-grants-2006_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07135475B2

Reaction notes

Loading…