Hexane → Ethyl 3-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphth-2-yl)propiolate
Reaction equation
[C:1]([C:3]1[CH:12]=[CH:11][C:10]2[C:9]([CH3:14])([CH3:13])[CH2:8][CH2:7][C:6]([CH3:16])([CH3:15])[C:5]=2[CH:4]=1)#[CH:2].C([Li])CCC.CCCCCC.[CH2:28]([O:30][C:31](Cl)=[O:32])[CH3:29]>CCOCC>[CH3:13][C:9]1([CH3:14])[CH2:8][CH2:7][C:6]([CH3:16])([CH3:15])[C:5]2[CH:4]=[C:3]([C:1]#[C:2][C:31]([O:30][CH2:28][CH3:29])=[O:32])[CH:12]=[CH:11][C:10]1=2Participants
6
Reactant 4
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- -10 °C
Procedure
To a cold solution (-78° C.) of 2-ethynyl,5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene (900 mgs, 4.3 mmols) in ether (20 ml) was added n-butyllithium in hexane (5.6 mmols). The mixture was stirred for 45 mins, and ethylchloroformate (1.3 g, 12 mmols) was added via syringe. Stirring was continued for 45 mins then the mixture was warmed gradually to -10° C. and quenched by adding sodium bicarbonate (NaHCO3) solution (10 ml). Diethyl ether (100 ml) was added, the organic phase washed with water (10 ml), brine (10 ml), and dried (MgSO4). The solvent was removed in vacuo. Purification of the residue over silicagel (5% ethylacetate in hexane) gave the title compound as a colorless oil.
Workup
- stirringStirring
- waitwas continued for 45 mins
- customquenched
- additionby adding sodium bicarbonate (NaHCO3) solution (10 ml)
- additionDiethyl ether (100 ml) was added
- washthe organic phase washed with water (10 ml), brine (10 ml)
- dry with materialdried (MgSO4)
- customThe solvent was removed in vacuo
- customPurification of the residue over silicagel (5% ethylacetate in hexane)
Sources & evidence
- ORD record
- ord-82a02ef58f05402c818d1112b01635c2
- Source dataset
- uspto-grants-1997_09
- Patent number
- US05663367
Reaction notes
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