2-Methylpiperazine → (RS)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(3-methyl-1-piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine

HRID 1084415Notes

Reaction equation

[CH:1]1([N:4]2[C:13]3[N:12]=[C:11]4[C:14]([F:20])=[C:15](F)[C:16]([F:18])=[CH:17][C:10]4=[CH:9][C:8]=3[C:7](=[O:21])[C:6]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:5]2)[CH2:3][CH2:2]1.[CH3:27][CH:28]1[CH2:33][NH:32][CH2:31][CH2:30][NH:29]1>>[CH:1]1([N:4]2[C:13]3[N:12]=[C:11]4[C:14]([F:20])=[C:15]([N:32]5[CH2:31][CH2:30][NH:29][CH:28]([CH3:27])[CH2:33]5)[C:16]([F:18])=[CH:17][C:10]4=[CH:9][C:8]=3[C:7](=[O:21])[C:6]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:5]2)[CH2:3][CH2:2]1

Participants

Reactant 2

HCID 660572-Methylpiperazine

HCID 185491641-Cyclopropyl-3-ethoxycarbonyl-7,8,9-trifluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine

Product 1

HCID 20063285(RS)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(3-methyl-1-piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine

Procedure

The (RS)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(3-methyl-1-piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine was prepared under the conditions of Example 35 but starting from 1.8 g of 1-cyclopropyl-3-ethoxycarbonyl-7,8,9-trifluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine and 2 g of (RS)-2-methylpiperazine. After recrystallizing once from 15 cm3 of propan-2-ol and 15 cm3 of diisopropyl ether, 1.9 g of (RS)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(3-methyl-1-piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine are obtained in the form of a yellow solid melting at 190° C.

Workup

customAfter recrystallizing once from 15 cm3 of propan-2-ol and 15 cm3 of diisopropyl ether, 1.9 g of (RS)-1-cyclopropyl-3-ethoxycarbonyl-7,9-difluoro-8-(3-methyl-1-piperazinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine

Sources & evidence

ORD record: ord-e34c247a475d41b0956fcaa5c2141ced
Source dataset: uspto-grants-1991_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05004745

Reaction notes

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