N-(tert-Butyloxycarbonyl)glycine N-hydroxysuccinimide ester → Tert-butyl (2-{[1-(1-isopropyl-6-oxo-1,6-dihydro-3-pyridazinyl)-2-oxo-2-phenylethyl]amino}-2-oxoethyl)carbamate

HRID 915016

Reaction equation

Cl.[NH2:2][CH:3]([C:12]1[CH:13]=[CH:14][C:15](=[O:21])[N:16]([CH:18]([CH3:20])[CH3:19])[N:17]=1)[C:4](=[O:11])[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.O=C1CCC(=O)N1[O:29][C:30](=O)[CH2:31][NH:32][C:33](=[O:39])[O:34][C:35]([CH3:38])([CH3:37])[CH3:36].C(N(C(C)C)C(C)C)C>C(Cl)Cl>[CH:18]([N:16]1[C:15](=[O:21])[CH:14]=[CH:13][C:12]([CH:3]([NH:2][C:30](=[O:29])[CH2:31][NH:32][C:33](=[O:39])[O:34][C:35]([CH3:36])([CH3:37])[CH3:38])[C:4](=[O:11])[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][CH:10]=2)=[N:17]1)([CH3:19])[CH3:20]

Participants

Conditions

Temperature: 22.5 °C

Procedure

Under ice-cooling, to a suspension of 6-(1-amino-2-oxo-2-phenylethyl)-2-isopropyl-3(2H)-pyridazinone hydrochloride (1.00 g) and tert-butyl {2-[(2,5-dioxo-1-pyrrolidinyl)oxy]-2-oxoethyl}carbamate (973 mg) in CH2Cl2 (10 ml) was added ethyl(diisopropyl)amine (0.651 ml) and stirred at the same temperature for 2 hours and at 20-25° C. for 18 hours. The mixture was washed with water, dried over MgSO4 and concentrated under reduced pressure to give syrup. The syrup was purified by column chromatography on silica gel (EtOAc only) to give tert-butyl (2-{[1-(1-isopropyl-6-oxo-1,6-dihydro-3-pyridazinyl)-2-oxo-2-phenylethyl]amino}-2-oxoethyl)carbamate as an amorphous solid (1.13 g).

Workup

washThe mixture was washed with water
dry with materialdried over MgSO4
concentrationconcentrated under reduced pressure
customto give syrup
customThe syrup was purified by column chromatography on silica gel (EtOAc only)

Sources & evidence

ORD record: ord-24b84654b7be4e2794f1aad9976c8871
Source dataset: uspto-grants-2007_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07265120B2

Linked notes

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