Cesium carbonate → HCID 58428457, compound

HRID 1008853Notes

Reaction equation

[Cl:1][C:2]1[C:3](O)=[N:4][C:5]2[C:10]([N:11]=1)=[CH:9][C:8](OC)=[CH:7][CH:6]=2.[C:15]([O-:18])([O-])=O.[Cs+].[Cs+].BrC1C=CC(S([O:31][C@@H:32]2[CH2:36][N:35]([C:37]([O:39][C:40]([CH3:43])([CH3:42])[CH3:41])=[O:38])[C@H:34]([C:44]([O:46][CH3:47])=[O:45])[CH2:33]2)(=O)=O)=CC=1>CN1C(=O)CCC1.O.CCOC(C)=O>[Cl:1][C:2]1[C:3]([O:31][C@H:32]2[CH2:36][N:35]([C:37]([O:39][C:40]([CH3:41])([CH3:42])[CH3:43])=[O:38])[C@H:34]([C:44]([O:46][CH3:47])=[O:45])[CH2:33]2)=[N:4][C:5]2[C:10]([N:11]=1)=[CH:9][CH:8]=[C:7]([O:18][CH3:15])[CH:6]=2

Participants

Conditions

Temperature: 50 °C

Procedure

A solution (0.35 M) of 3-chloro-6-methoxyquinoxalin-2-ol in NMP was treated with Cs2CO3 (1.5 eq) and 1-tert-butyl 2-methyl (2S,4S)-4-{[(4-bromophenyl)sulfonyl]oxy}pyrrolidine-1,2-dicarboxylate (1.1 eq). The resulting mixture was stirred at 50° C. for 18 h, then a further portion (0.1 eq) of 1-tert-butyl 2-methyl (2S,4S)-4-{[(4-bromophenyl)sulfonyl]oxy}pyrrolidine-1,2-dicarboxylate was added. After stirring for 2 h, the mixture was cooled and diluted with H2O and EtOAc. The organic phases were washed with aqueous HCl (1 N), saturated aqueous NaHCO3 and brine. The dried organic phase was concentrated to a residue that was purified by flash-chromatography (0-60% EtOAc/petroleum ether) to give the title compound (35% for two steps) as a solid. MS (ES+) m/z 438 (M+H)+

Workup

stirringAfter stirring for 2 h
temperaturethe mixture was cooled
washThe organic phases were washed with aqueous HCl (1 N), saturated aqueous NaHCO3 and brine
concentrationThe dried organic phase was concentrated to a residue that
customwas purified by flash-chromatography (0-60% EtOAc/petroleum ether)

Sources & evidence

ORD record: ord-8ad8e5605e5c497cb5d72223df89e048
Source dataset: uspto-grants-2011_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07973040B2

Reaction notes

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