Cesium carbonate → HCID 67453859, compound

HRID 1465103Notes

Reaction equation

HRID 1465103 reaction equation
C(=O)(OC)[O:2][C:3]1[CH:8]=[C:7]([N+:9]([O-:11])=[O:10])[C:6](Br)=[CH:5][C:4]=1[CH:13]1[CH2:17][CH2:16][CH2:15][CH2:14]1.CC1(C)C(C)(C)OB([C:29]2[CH2:30][CH2:31][N:32]([C:35]([O:37][C:38]([CH3:41])([CH3:40])[CH3:39])=[O:36])[CH2:33][CH:34]=2)O1.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:13]1([C:4]2[C:3]([OH:2])=[CH:8][C:7]([N+:9]([O-:11])=[O:10])=[C:6]([C:29]3[CH2:34][CH2:33][N:32]([C:35]([O:37][C:38]([CH3:41])([CH3:40])[CH3:39])=[O:36])[CH2:31][CH:30]=3)[CH:5]=2)[CH2:14][CH2:15][CH2:16][CH2:17]1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 593949534-Bromo-2-cyclopentyl-5-nitrophenyl methyl carbonate

Product 1

HCID 67453859HCID 67453859, compoundYield 77%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
90 °C

Procedure

4-Bromo-2-cyclopentyl-5-nitrophenyl methyl carbonate (700 mg, 2.03 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylate (629 mg, 2.03 mmol), Pd(PPh3)4 (235 mg, 0.20 mmol), and Cs2CO3 (1325 mg, 4.07 mmol) were combined in DMF (10 mL) and heated at 90° C. for 4 h under N2 atmosphere. The reaction was diluted with water and extracted with dichloromethane (3×10 mL). The organic fractions were combined, dried over MgSO4, filtered and concentrated. Purification by silica gel chromatography (0-100% ethyl acetate/hexanes) yielded tert-butyl 4-(5-cyclopentyl-4-hydroxy-2-nitrophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (596 mg, 77% yield). LC/MS m/z 389.4 [M+H]+.

Workup

  1. extractionextracted with dichloromethane (3×10 mL)
  2. dry with materialdried over MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customPurification by silica gel chromatography (0-100% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-b42828a595a44cdd8e057f7c63c4fff8
Source dataset
uspto-grants-2015_04
Patent number
US08999976B2

Reaction notes

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