Ammonium Chloride → 4-[6 (t-Butyldimethylsilyloxy)-1-hexynyl]-4-hydroxy-7-methoxy-3-(4-methoxyphenyl)-3-methylthiochroman

HRID 1792377Notes

Reaction equation

HRID 1792377 reaction equation
[Si:1]([O:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]#[CH:14])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([Li])CCC.[CH3:20][O:21][C:22]1[CH:31]=[C:30]2[C:25]([C:26](=[O:41])[C:27]([C:33]3[CH:38]=[CH:37][C:36]([O:39][CH3:40])=[CH:35][CH:34]=3)([CH3:32])[CH2:28][S:29]2)=[CH:24][CH:23]=1.[Cl-].[NH4+]>O1CCCC1>[Si:1]([O:8][CH2:9][CH2:10][CH2:11][CH2:12][C:13]#[C:14][C:26]1([OH:41])[C:25]2[C:30](=[CH:31][C:22]([O:21][CH3:20])=[CH:23][CH:24]=2)[S:29][CH2:28][C:27]1([C:33]1[CH:34]=[CH:35][C:36]([O:39][CH3:40])=[CH:37][CH:38]=1)[CH3:32])([C:4]([CH3:5])([CH3:6])[CH3:7])([CH3:3])[CH3:2]

Participants

6

Reactant 4

HCID 25517Ammonium ChlorideHCID 109799547-Methoxy-3-(4-methoxyphenyl)-3-methylthiochroman-4-oneHCID 110094486-(t-Butyldimethylsilyloxy)-1-hexyneHCID 178418339Butyllithium

Product 1

HCID 187702474-[6 (t-Butyldimethylsilyloxy)-1-hexynyl]-4-hydroxy-7-methoxy-3-(4-methoxyphenyl)-3-methylthiochromanYield 93.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-20 °C

Procedure

To a solution of 6-(t-butyldimethylsilyloxy)-1-hexyne (10.8 g, 50.9 mmol) in dry tetrahydrofiuran (100 ml) was added dropwise n-butyl lithium (30.1 ml, 48.9 mmol, 1.63M in tetrahydrofuran) at −78° C., which was then stirred at −20° C. for 1 hour. To the reaction mixture , was then added 7-methoxy-3-(4-methoxyphenyl)-3-methylthiochroman-4-one (8.0 g, 25.5 mmol) dissolved in tetrahydrofuran at −78 C for 30 min, and the resulting mixture was stirred at −10° C. (for 24 hours. After the reaction was completed, saturated ammonium chloride solution was added to the reaction solution, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was subjected to column chromatography (n-hexane:ethyl acetate=4:1) to give the title compound (12.5 g, yield: 93%).

Workup

  1. stirringthe resulting mixture was stirred at −10° C. (for 24 hours
  2. extractionthe mixture was extracted with ethyl acetate
  3. dry with materialThe extract was dried over anhydrous sodium sulfate
  4. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-ae864e8e07614a33b661deb59b3726e9
Source dataset
uspto-grants-2006_07
Patent number
US07074819B2

Reaction notes

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