Sodium methanethiolate → 7-Hydroxy-6-methoxy-2-methylsulfanyl-3-(3,4,5-trimethoxybenzoyl)benzofuran
Reaction equation
Br[C:2]1[O:3][C:4]2[C:24]([O:25]C(=O)C)=[C:23]([O:29][CH3:30])[CH:22]=[CH:21][C:5]=2[C:6]=1[C:7](=[O:20])[C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=1.[CH3:31][S-:32].[Na+]>CO>[OH:25][C:24]1[C:4]2[O:3][C:2]([S:32][CH3:31])=[C:6]([C:7](=[O:20])[C:8]3[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=3)[C:5]=2[CH:21]=[CH:22][C:23]=1[O:29][CH3:30]Participants
4
Procedure
To a suspension of 2-Bromo-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxybenzofuran (22 mg, 0.046 mmol) in methanol (1 ml) in a screw cap vial was added sodium thiomethoxide (16 mg, 0.23 mmol) and the resulting orange solution was shaken for 20 minutes during which time the reaction became homogeneous. The crude reaction mixture was concentrated onto silica and chromatographed (silica gel, eluent=2:1 hexanes:ethyl acetate) to give the product as a resin (10 mg, 54%) that could be crystallised by standing in hexanes in the freezer overnight; 1H NMR (CDCl3) δ 7.08 (s, 2H), 6.92 (d, J=8.3 Hz, 1H), 6.82 (d, J=8.3 Hz, 1H), 5.73 (br s, 1H), 3.93 (s, 3H), 3.92 (s, 3H), 3.84 (s, 6H), 2.66 (s, 3H).
Workup
- customcap
- customThe crude reaction mixture
- concentrationwas concentrated onto silica
- customchromatographed (silica gel, eluent=2:1 hexanes:ethyl acetate)
- customto give the product as a resin (10 mg, 54%) that
- customcould be crystallised
- customby standing in hexanes in the freezer overnight
Sources & evidence
- ORD record
- ord-299b1ac2b5544b22bfe91c4ccd52b9c9
- Source dataset
- uspto-grants-2012_06
- Patent number
- US08198466B2
Reaction notes
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