Water → (S)-tert-butyl 3-(6-bromo-3-carbamoylpyrrolo[1,2-b]pyridazin-4-ylamino)piperidine-1-carboxylate

HRID 877724Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[C:4]2[C:9](Cl)=[C:8]([C:11]([NH2:13])=[O:12])[CH:7]=[N:6][N:5]2[CH:14]=1.[NH2:15][C@H:16]1[CH2:21][CH2:20][CH2:19][N:18]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:17]1.CCN(C(C)C)C(C)C.O>CN(C=O)C>[Br:1][C:2]1[CH:3]=[C:4]2[C:9]([NH:15][C@H:16]3[CH2:21][CH2:20][CH2:19][N:18]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:17]3)=[C:8]([C:11](=[O:12])[NH2:13])[CH:7]=[N:6][N:5]2[CH:14]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A solution of 6-bromo-4-chloropyrrolo[1,2-b]pyridazine-3-carboxamide (Intermediate 2, 171 mg, 0.62 mmol) and (S)-tert-butyl 3-aminopiperidine-1-carboxylate (125 mg, 0.62 mmol) in DMF (4 mL) was added DIPEA (0.326 mL, 1.87 mmol). The mixture was heated at 80° C. for 18 h then cooled to rt. Water (16 mL) was added and the resulting suspension was stirred for 1 h. The solids were filtered, rinsed with water (2×), and then dried to afford the crude product which was purified via silica gel chromatography (10% to 50% ethyl acetate in hexanes) to afford the title compound (175 mg, 64% yield) as a pale yellow solid. 1H NMR (DMSO-d6, 400 MHz) δ 10.89 (br s, 1H), 8.26 (s, 1H), 7.90 (d, J=1.5 Hz, 1H), 7.00 (br m, 2H), 4.18 (s, 1H), 3.68 (m, 1H), 3.35 (m, 3H), 1.99 (m, 1H), 1.70 M, 1H), 1.57 (m, 1H), 1.23 br s, 9H).

Workup

temperaturethen cooled to rt
filtrationThe solids were filtered
washrinsed with water (2×)
customdried
customto afford the crude product which
customwas purified via silica gel chromatography (10% to 50% ethyl acetate in hexanes)

Sources & evidence

ORD record: ord-cc07d43676554fc483d4d40891161ed7
Source dataset: uspto-grants-2015_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08987268B2

Reaction notes

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