Sodium Carbonate → 1-methyl-5-(2-thioxo-1,2-dihydrospiro[3,1-benzoxazine-4,1'-cyclobutan]-6-yl)-1H-pyrrole-2-carbonitrile

HRID 915897Notes

Reaction equation

HRID 915897 reaction equation
[CH3:1][N:2]1[C:6]([C:7]2[CH:8]=[CH:9][C:10]3[NH:19][C:18](=O)[O:17][C:13]4([CH2:16][CH2:15][CH2:14]4)[C:11]=3[CH:12]=2)=[CH:5][CH:4]=[C:3]1[C:21]#[N:22].COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:32])=CC=1.C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1>[CH3:1][N:2]1[C:6]([C:7]2[CH:8]=[CH:9][C:10]3[NH:19][C:18](=[S:32])[O:17][C:13]4([CH2:16][CH2:15][CH2:14]4)[C:11]=3[CH:12]=2)=[CH:5][CH:4]=[C:3]1[C:21]#[N:22]

Participants

5

Reactant 3

HCID 10340Sodium CarbonateHCID 87949Lawesson's reagentHCID 113583221-methyl-5-(2-oxo-1,2-dihydrospiro [3,1-benzoxazine-4,1'-cyclobutan]-6-yl)-1H-pyrrole-2-carbonitrile

Product 1

HCID 104254421-methyl-5-(2-thioxo-1,2-dihydrospiro[3,1-benzoxazine-4,1'-cyclobutan]-6-yl)-1H-pyrrole-2-carbonitrileYield 99.9%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

A solution of 1-methyl-5-(2-oxo-1,2-dihydrospiro [3,1-benzoxazine-4,1′-cyclobutan]-6-yl)-1H-pyrrole-2-carbonitrile (0.33 g, 1.1 mmol) and Lawesson's Reagent (0.23 g, 0.55 mmol) in toluene (10 mL) was heated at 100° C. Upon completion by TLC, the reaction mixture was poured into saturated sodium carbonate (100 mL) and extracted with ethyl acetate (50 mL), dried over magnesium sulfate, and concentrated. Trituration of the residue with ether (20 mL) gave 1-methyl-5-(2-thioxo-1,2-dihydrospiro[3,1-benzoxazine-4,1′-cyclobutan]-6-yl)-1H-pyrrole-2-carbonitrile (0.17 g, 49%) as a tan solid. 1H NMR (DMSO-d6): δ 12.35 (s, 1H), 7.64 (d, 1H, J=2.0 Hz), 7.51 (dd, 1H, J=8.2, 2.0 Hz), 7.15 (d, 1H, J=8.3 Hz), 7.05 (d, 1H, J=4.03 Hz), 6.43 (d, 1H, J=4.03 Hz), 3.73 (s, 3H), 2.59-2.53 (m, 2H), 2.09-2.02 (m, 2H), 1.93-1.85 (m, 2H). MS (ESI) m/z 310 ([M+H]+); MS (ESI) m/z 308 ([M−H]−); HRMS: calcd for C17H15N3OS, 309.0936; found (ESI_FT), 310.10057.

Workup

  1. extractionextracted with ethyl acetate (50 mL)
  2. dry with materialdried over magnesium sulfate
  3. concentrationconcentrated

Sources & evidence

ORD record
ord-a897f8dd7646439fadf0188c7dce988d
Source dataset
uspto-grants-2007_09
Patent number
US07268149B2

Reaction notes

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