Hydrochloric Acid → m-Methoxycinnamyl alcohol
Reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:12]=[CH:13][CH:14]=1)[CH:6]=[CH:7][C:8](OC)=[O:9].[H-].C([Al+]CC(C)C)C(C)C.C(OCC)(=O)C.CCCCCC.Cl>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:12]=[CH:13][CH:14]=1)[CH:6]=[CH:7][CH2:8][OH:9]Participants
Procedure
the methyl m-methoxycinnamate was taken up in 50 ml of anhydrous toluene and chilled to -70° under nitrogen. Diisobutylaluminum hydride (54 ml; 83 mM; 1.54M in toluene) was added dropwise through a side-arm addition funnel. Some starting material remained as detected by TLC (35% ethyl acetate/hexane on silica gel) so a further 15 ml of diisobutylaluminum hydride was added. The reaction was allowed to warm to room temperature and then carefully quenched with water at 0° giving an emulsion. The emulsion was taken up in cold 2N aqueous hydrochloric acid and partitioned. The aqueous layer was extracted twice with ether and the combined organic layers were washed with 2.5N aqueous sodium hydroxide and with brine. The organic extracts were then dried over K2CO3 and stripped of volatiles in vacuo. The clear oil was chromatographed on one cartridge in a Water's Prep 500 with 35% ethyl acetate in hexane to give 9.38 g (71% yield) of m-methoxycinnamyl alcohol.
Workup
- temperaturechilled to -70° under nitrogen
- additionwas added
- customcarefully quenched with water at 0°
- customgiving an emulsion
- custompartitioned
- extractionThe aqueous layer was extracted twice with ether
- washthe combined organic layers were washed with 2.5N aqueous sodium hydroxide and with brine
- dry with materialThe organic extracts were then dried over K2CO3
- customThe clear oil was chromatographed on one cartridge in a Water'
Sources & evidence
- ORD record
- ord-d8ad2a321edc48a8b945d42f8ba7f345
- Source dataset
- uspto-grants-1987_08
- Patent number
- US04686235
Reaction notes
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