Tributylvinyltin → 1-Chloro-3-methyl-2-vinylnaphthalene
Reaction equation
FC(F)(F)S(O[C:7]1[C:16]([CH3:17])=[CH:15][C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]=1[Cl:18])(=O)=O.[CH2:21]([Sn](CCCC)(CCCC)C=C)[CH2:22]CC.[Cl-].[Li+]>C(OCC)(=O)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[Cl:18][C:8]1[C:9]2[C:14](=[CH:13][CH:12]=[CH:11][CH:10]=2)[CH:15]=[C:16]([CH3:17])[C:7]=1[CH:21]=[CH2:22]Participants
Conditions
- Temperature
- 50 °C
Procedure
To a solution of 1-chloro-3-methylnaphthalen-2-yl trifluoromethanesulfonate (4C) (14.75 g, 45.43 mmol), tributyl(vinyl)tin (14.59 mL, 49.97 mmol) and lithium chloride (5.78 g, 136.29 mmol) was added bis(triphenylphosphine)palladium(II) dichloride under Ar. The reaction mixture was heated at 50° C. for 20 h, then heated at 90° C. for 8 h. The reaction mixture was than cooled to room temperature, diluted with ethyl acetate, washed with 5% lithium chloride solution (3×), brine and dried (MgSO4), filtered and then concentrated and purified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes) to give 4D contaminated by organotin. The residue was dissolved in dichloromethane and stirred with 10% KF solution overnight. The resulting white mixture was filtered through a pad of Celite and extracted with dichloromethane (2×). The organic layer was concentrated and purified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes) to give 4D as a pale yellow oil (10.1 g).
Workup
- temperatureheated at 90° C. for 8 h
- temperaturethan cooled to room temperature
- washwashed with 5% lithium chloride solution (3×), brine
- dry with materialdried (MgSO4)
- filtrationfiltered
- concentrationconcentrated
- custompurified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes)
Sources & evidence
- ORD record
- ord-3e12b4fff65a480c906bf826f3f23587
- Source dataset
- uspto-grants-2015_08
- Patent number
- US09102614B2
Reaction notes
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