2,6-Lutidine → [1-Cyano-5-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-1,3-dimethyl-pent-3-enyl]-phosphonic Acid

HRID 272183Notes

Reaction equation

HRID 272183 reaction equation
C([O:3][P:4]([C:9]([C:36]#[N:37])([CH3:35])[CH2:10][C:11]([CH3:34])=[CH:12][CH2:13][C:14]1[C:15]([O:27]CC[Si](C)(C)C)=[C:16]2[C:20](=[C:21]([CH3:25])[C:22]=1[O:23][CH3:24])[CH2:19][O:18][C:17]2=[O:26])(=[O:8])[O:5]CC)C.C[Si](Br)(C)C.N1C(C)=CC=CC=1C>CN(C=O)C.C(Cl)Cl>[C:36]([C:9]([P:4](=[O:3])([OH:5])[OH:8])([CH3:35])[CH2:10][C:11]([CH3:34])=[CH:12][CH2:13][C:14]1[C:15]([OH:27])=[C:16]2[C:20](=[C:21]([CH3:25])[C:22]=1[O:23][CH3:24])[CH2:19][O:18][C:17]2=[O:26])#[N:37]

Participants

6

Reactant 3

HCID 79372,6-LutidineHCID 76113BromotrimethylsilaneHCID 72563641{1-Cyano-5-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-1,3-dimethyl-pent-3-enyl}-phosphonic Acid Diethyl Ester

Product 1

HCID 67010476[1-Cyano-5-(4-hydroxy-6-methoxy-7-methyl-3-oxo-1,3-dihydro-isobenzofuran-5-yl)-1,3-dimethyl-pent-3-enyl]-phosphonic AcidYield 33%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of {1-cyano-5-[6-methoxy-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-1,3-dimethyl-pent-3-enyl}-phosphonic acid diethyl ester (18 mg, 0.04 mmol) in DMF (0.5 mL) and DCM (0.5 mL) was added TMSBr (51 μL, 0.4 mmol) and 2,6-lutidine (46 μL, 0.4 mmol). The reaction solution was allowed stir at room temperature overnight before quenching with MeOH. The reaction mixture was dried under reduced pressure and the residue was purified by RP HPLC using a C18 column with a gradient of H2O, 0.1% TFA-acetonitrile, 0.1% TFA to provide 4.5 mg (33%) of the desired product. 1H NMR (300 MHz, CD3OD) δ 1.37 (d, 3H), 1.87 (s, 3H), 2.13 (s, 3H), 2.26 (m, 1H), 2.64 (m, 1H), 3.39 (m, 2H), 3.75 (s, 3H), 5.18 (s, 2H), 5.34 (m, 1H) ppm; 31P (121.4 MHz, CD3OD) δ 21.47 ppm; MS (m/z) 422 [M−H]−, 424 [M+H]+.

Workup

  1. custombefore quenching with MeOH
  2. customThe reaction mixture was dried under reduced pressure
  3. customthe residue was purified by RP HPLC

Sources & evidence

ORD record
ord-a54cb25a070e43d78e09d073fa74da92
Source dataset
uspto-grants-2008_11
Patent number
US07452901B2

Reaction notes

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