Chlorotrimethylsilane → 3-(Benzylthio)-4-hydroxy-6-(4-hydroxyphenyl)pyran-2-one

HRID 2393977Notes

Reaction equation

HRID 2393977 reaction equation
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][CH:3]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].Cl[Si](C)(C)C.[C:26]1([CH2:32][S:33][CH:34]([C:38](O)=[O:39])[C:35](O)=[O:36])[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>C1COCC1>[OH:39][C:38]1[CH:9]=[C:8]([C:5]2[CH:6]=[CH:7][C:2]([OH:1])=[CH:3][CH:4]=2)[O:10][C:35](=[O:36])[C:34]=1[S:33][CH2:32][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1

Participants

6

Reactant 4

HCID 6397ChlorotrimethylsilaneHCID 74694'-HydroxyacetophenoneHCID 2733832Lithium HexamethyldisilazideHCID 19596125[(Phenylmethyl)thio]propanedioic acid

Product 1

HCID 546812343-(Benzylthio)-4-hydroxy-6-(4-hydroxyphenyl)pyran-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

The title compound was prepared by Method A using 4'-hydroxyacetophenone (0.722 g, 5.31 mmol), lithium bis(trimethylsilyl)amide (1.95 g, 11.6 mmol), chlorotrimethylsilane (1.48 mL, 11.6 mmol), THF (116 mL), and diethyl ester of [(phenylmethyl)thio]propanedioic acid (1.00 g, 3.54 mmol). m.p. dec. 204° C.; 1H NMR (250 MHz, DMSO-d6) δ 3.96 (s, 2 H), 6.55 (s, 1 H), 6.88 (d, 2 H), 7.39 (m, 5 H), 7.63 (d, 2 H), 10.28 (s, 1 H), 11.75 (bs, 1 H).

Workup

  1. custom204° C.

Sources & evidence

ORD record
ord-1eea09a52cf74ee7a3e47575760f9675
Source dataset
uspto-grants-1998_09
Patent number
US05808062

Reaction notes

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