Cesium carbonate → HCID 59279885, compound

HRID 1875376Notes

Reaction equation

C([O-])([O-])=O.[Cs+].[Cs+].BrC1C=CC(S([O:17][C@@H:18]2[CH2:22][N:21]([C:23]([O:25][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:24])[C@H:20]([C:30]([O:32][CH3:33])=[O:31])[CH2:19]2)(=O)=O)=CC=1.[Br:34][C:35]1[CH:36]=[C:37]2[C:42](=[CH:43][C:44]=1[O:45][CH3:46])[NH:41][C:40](=[O:47])[CH:39]=[C:38]2O>CN1C(=O)CCC1>[Br:34][C:35]1[CH:36]=[C:37]2[C:42](=[CH:43][C:44]=1[O:45][CH3:46])[NH:41][C:40](=[O:47])[CH:39]=[C:38]2[O:17][C@H:18]1[CH2:22][N:21]([C:23]([O:25][C:26]([CH3:27])([CH3:28])[CH3:29])=[O:24])[C@H:20]([C:30]([O:32][CH3:33])=[O:31])[CH2:19]1

Participants

Conditions

Temperature: 60 °C

Procedure

Cs2CO3 (8.42 g, 25.8 mmol) was added to a solution of 1-t-butyl 2-methyl (2S,4S)-4-{[(4-bromophenyl)sulfonyl]oxy}pyrrolidine-1,2-dicarboxylate (4 g, 8.61 mmol) and the product from Step 1, (3.49 g, 12.92 mmol) in NMP (86 ml) under N2. The mixture was then heated to 60° C. for 6.5 hours, cooled to RT and partitioned between water and EtOAc. The organic layer was washed with water and brine, dried over MgSO4, and the solvent removed in vacuo. The crude product (6.5 g) was purified on silica (gradient elution, 0-100% EtOAc/hexane, then 0-5% MeOH/DCM) to yield the title compound (2.26 g). LRMS ESI+ ((M-Boc)+H)+ 397.3/399.3.

Workup

temperaturecooled to RT
custompartitioned between water and EtOAc
washThe organic layer was washed with water and brine
dry with materialdried over MgSO4
customthe solvent removed in vacuo
customThe crude product (6.5 g) was purified on silica (
washgradient elution, 0-100% EtOAc/hexane

Sources & evidence

ORD record: ord-bf12f175b23c460a9adab67dab8ef5f6
Source dataset: uspto-grants-2012_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08309540B2

Reaction notes

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