(R)-sec-butylamine → 3-[2-((R)-sec-Butylamino)-3,4-dioxo-cyclobut-1-enylamino]-6-chloro-2-hydroxy-N-methoxy-N-methyl-benzenesulfonamide

HRID 516904

Reaction equation

[Cl:1][C:2]1[C:7]([S:8]([N:11]([O:13][CH3:14])[CH3:12])(=[O:10])=[O:9])=[C:6]([OH:15])[C:5]([NH:16][C:17]2[C:20](=O)[C:19](=[O:22])[C:18]=2[O:23]CC)=[CH:4][CH:3]=1.[NH2:26][C@@H:27]([CH2:29][CH3:30])[CH3:28]>C1COCC1>[C@H:27]([NH:26][C:20]1[C:19](=[O:22])[C:18](=[O:23])[C:17]=1[NH:16][C:5]1[C:6]([OH:15])=[C:7]([S:8]([N:11]([O:13][CH3:14])[CH3:12])(=[O:10])=[O:9])[C:2]([Cl:1])=[CH:3][CH:4]=1)([CH2:29][CH3:30])[CH3:28]

Participants

Conditions

Temperature: 50 °C

Procedure

To a stirred solution of 6-chloro-3-(2-ethoxy-3,4-dioxo-cyclobut-1-enylamino)-2-hydroxy-N-methoxy-N-methyl-benzenesulfonamide (Intermediate A) (1 g, 2.56 mmol) in THF (20 ml) was added (R)-(−)-2-aminobutane (0.52 ml, 5.12 mmol). The reaction mixture was heated at 50° C. for 7 hours. The reaction mixture was concentrated in vacuo and dissolved in EtOAc. The EtOAc solution was washed with 1M HCl(aq) and brine. The EtOAc solution was dried (MgSO4) and concentrated in vacuo. The residue was crystallized from toluene to give a solid; [M+H]+ 418.2. 1H NMR (DMSO) 0.9 (3H, t, CH3), 1.2 (3H, d, CH3), 1.5 (2H, m), 3.0 (3H, s, CH3), 3.6 (3H, s, CH3), 4.0 (1H, m), 7.2 (1H, d), 8.1 (1H, d), 8.3 (1H, d), 9.4 (1H, s), 10.1 (1H, s).

Workup

concentrationThe reaction mixture was concentrated in vacuo
dissolutiondissolved in EtOAc
washThe EtOAc solution was washed with 1M HCl(aq) and brine
dry with materialThe EtOAc solution was dried (MgSO4)
concentrationconcentrated in vacuo
customThe residue was crystallized from toluene
customto give a solid

Sources & evidence

ORD record: ord-16ab257e1ab1494788fd1327067041ed
Source dataset: uspto-grants-2015_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09115087B2

Linked notes

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