Acetone Cyanohydrin → 5,6-Dihydro-4-hydroxy-3-[(3-methylphenyl)methyl]-6,6-diphenyl-2H-pyran-2-one

HRID 357878Notes

Reaction equation

HRID 357878 reaction equation
[OH:1][C:2]1[CH2:7][C:6]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[O:5][C:4](=[O:20])[CH:3]=1.CCN(CC)CC.[CH3:28][C:29]1[CH:30]=[C:31]([CH:35]=[CH:36][CH:37]=1)[C:32](Cl)=O.CC(C)(O)C#N.C([BH3-])#N.[Na+]>C(O)(=O)C.C(#N)C.C(Cl)Cl>[OH:1][C:2]1[CH2:7][C:6]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[O:5][C:4](=[O:20])[C:3]=1[CH2:28][C:29]1[CH:37]=[CH:36][CH:35]=[C:31]([CH3:32])[CH:30]=1

Participants

9

Reactant 5

HCID 6406Acetone CyanohydrinHCID 8471Triethylamine2×HCID 743753-Methylbenzoyl chlorideHCID 5003444Sodium cyanoborohydrideHCID 546804105,6-dihydro-4-hydroxy-6,6-diphenyl-2H-pyran-2-one

Product 1

HCID 547217805,6-Dihydro-4-hydroxy-3-[(3-methylphenyl)methyl]-6,6-diphenyl-2H-pyran-2-one

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 6342AcetonitrileSolventHCID 6344DichloromethaneSolvent

Procedure

The title compound was prepared as described in General Method 8 using the following: 5,6-dihydro-4-hydroxy-6,6-diphenyl-2H-pyran-2-one (0.300 g, 1.13 mmol), Et3N 0.16 mL, 1.15 mmol), 3-methylbenzoyl chloride (0.15 mL, 1.13 mmol), CH2Cl2 (4.0 mL), acetonitrile (4.0 mL), acetone cyanohydrin (0.05 mL, 0.58 mmol), Et3N (0.32 mL, 2.3 mmol), glacial acetic acid (4.0 mL), sodium cyanoborohydride (0.28 g, 4.5 mmol). Purification was achieved by submitting the final residue to column chromatograpy (SiO2, 100% CH2Cl2 to 1% MeOH in CH2 Cl2) to provide a solid (0.223 g, m.p. 57°-59° C.). 1H NMR (400 MHz, DMSO-d6) δ 11.112 (bs, 1 H), 7.414-7.270 (m, 10 H), 6.875-6.812 (m, 2 H), 6.429-6.392 (m, 2 H), 3.527 (s, 2 H), 3.409 (s, 2 H), 2.060 (s, 3 H).

Workup

  1. customPurification

Sources & evidence

ORD record
ord-b7366352cac34173bd32d119e6163bec
Source dataset
uspto-grants-1998_11
Patent number
US05840751

Reaction notes

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