Triethylamine → {(S)-1-[hydroxy-(5-thiophen-3-yl-1,2,4-oxadiazol-3-yl)-methyl]-propyl}-carbamic acid tert-butyl ester

HRID 1765683Notes

Reaction equation

[C:1]([O:5][C:6](=[O:17])[NH:7][C@H:8]([CH:11]([OH:16])[C:12](=[NH:15])[NH:13][OH:14])[CH2:9][CH3:10])([CH3:4])([CH3:3])[CH3:2].[S:18]1[CH:22]=[CH:21][CH:20]=[C:19]1C(Cl)=O.[CH2:26](N(CC)CC)C>O1CCOCC1>[C:1]([O:5][C:6](=[O:17])[NH:7][C@H:8]([CH:11]([OH:16])[C:12]1[N:15]=[C:26]([C:20]2[CH:21]=[CH:22][S:18][CH:19]=2)[O:14][N:13]=1)[CH2:9][CH3:10])([CH3:2])([CH3:3])[CH3:4]

Participants

Conditions

Temperature: 150 °C

Procedure

A suspension of {(S)-1-[hydroxy-(N-hydroxycarbamimidoyl)-methyl]-propyl}-carbamic acid tert-butyl ester (2.4 g, 9.7 mmol) in dioxane (15 ml) was treated with thiophene carbonyl chloride (1.45 g, 9.9 mmol) and triethylamine (1.36 ml, 9.8 mmol) and the mixture heated at 150° C. in a microwave (Smith Creator, S00219) for 15 minutes. Solvent evaporated under reduced pressure. The residue was subjected to flash chromatography eluting with a mixture of ethyl acetate and heptane to give {(S)-1-[hydroxy-(5-thiophen-3-yl-1,2,4-oxadiazol-3-yl)-methyl]-propyl}-carbamic acid tert-butyl ester, a mixture of diastereoisomers, (144 mg) as a brown solid. 1H NMR (CDCl3): 8.21 (m, 1H), 7.66 (m, 1H), 7.45 (m, 1H), 4.92–4.69 (m, 2H), 5.02–4.80 (m, 2H), 4.10–3.85 (2×m, 1H), 1.80–1.45 (m, 2H), 1.46 & 1.38 (2×s, 9H), 1.01 & 0.99 (2×t, J=7.5 Hz, 3H). MS: 340 (MH+).

Workup

customSolvent evaporated under reduced pressure
washeluting with a mixture of ethyl acetate and heptane

Sources & evidence

ORD record: ord-52b00f39a9374a9f964c340e9e422d14
Source dataset: uspto-grants-2007_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07226921B2

Reaction notes

Loading…