3-Chloro-2-methyl-1-propene → HCID 68967130, compound
Reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[C:4]([O:9][CH3:10])[CH:3]=1.[H-].[Na+].Cl[CH2:14][C:15]([CH3:17])=[CH2:16]>>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH2:16][C:15]([CH3:17])=[CH2:14])=[C:4]([O:9][CH3:10])[CH:3]=1Participants
Procedure
Treatment of 4-chloro-2-methoxyphenol (15.00 g, 0.10 mol) with sodium hydride (4.4 g, 0.11 mol, 60 wt. %) and 3-chloro-2-methylpropene (12.00 g, 0.12 mol) generally according to the procedure described for Intermediate 13 provided 19.3 g (91%) of 4-chloro-2-methoxy-1-[(2-methylprop-2-enyl)oxy]benzene as a colorless oil. Treatment of the allyl ether in refluxing mesitylene generally according to the procedure described for Intermediate 8 afforded 15.5 g (78%) of 4-chloro-2-methoxy-6-(2-methylprop-2-enyl)phenol as a pale yellow oil. Treatment of 4-chloro-2-methoxy-6-(2-methylprop-2-enyl)phenol (10.00 g, 0.047 mol) with 3-chloroperoxybenzoic acid (20.00 g, 0.089 mol, 77%) followed by potassium carbonate (20.00 g, 0.145 mol) generally according to the Procedure described for Intermediate 9 provided 8.00 g (74%) of (±)-(5-chloro-7-methoxy-2-methyl-2,3-dihydro-1-benzofuran-2-yl)methanol as a light yellow oil. Treatment of (±)-(5-chloro-7-methoxy-2-methyl-2,3-dihydro-1-benzofuran-2-yl)methanol (10.8 g, 0.047 mol) with p-toluenesulfonyl chloride (13.5 g, 0.071 mol), diisopropylethylamine (12.15 g, 0.094 mol), and 4-(dimethylamino)pyridine (0.35 g, 2.83 mmol) generally according to the procedure described for Intermediate 45 gave 13.8 g (76%) of (±)-(5-chloro-7-methoxy-2-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate as a white solid. mp 113-115° C.; Anal. calcd. for C18H19ClO5S: C, 56.47; H, 5.00. Found: C, 55.82; H, 4.94.
Sources & evidence
- ORD record
- ord-00ec9d2ec2964483887b462c30302f3e
- Source dataset
- uspto-grants-2008_10
- Patent number
- US07435837B2
Reaction notes
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