HCID 12747881, compound → HCID 12747908, compound
Reaction equation
[Cl:1][C:2]1[C:13]([C:14](=[O:20])[C:15]2[S:19][CH:18]=[CH:17][CH:16]=2)=[CH:12][C:5]2[CH2:6][CH:7]([C:9](O)=[O:10])[O:8][C:4]=2[C:3]=1[Cl:21]>O1CCCC1.C(=O)(O)[O-].[Na+]>[Cl:1][C:2]1[C:13]([C:14](=[O:20])[C:15]2[S:19][CH:18]=[CH:17][CH:16]=2)=[CH:12][C:5]2[CH2:6][CH:7]([CH2:9][OH:10])[O:8][C:4]=2[C:3]=1[Cl:21]Participants
Reactant 1
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 25 °C
Procedure
To a stirred solution of (±) 6,7-dichloro-2,3-dihydro-5-(2-thenoyl)benzofuran-2-carboxylic acid (3.4 g., 0.01 mole) in tetrahydrofuran (50 ml.) at 0° C. is added the borane-tetrahydrofuran complex (25 ml., 0.00625 mole) over a one-half hour period. The reaction solution is stirred one hour at 0° C. and 18 hours at 25° C. The reaction solution is diluted with aqueous sodium bicarbonate (50 ml.) and the water layer is separated and the extracted twice with ether (two 20 ml. portions). The organic layers are combined, washed with brine (two 10 ml. portions), dried over magnesium sulfate and the solvents distilled at reduced pressure. The (±)6,7-dichloro-2,3-dihydro-2-hydroxymethyl-5-(2-thenoyl)benzofuran is purified by column chromatography on silica gel (95% benzene-5% methanol) and melts at 65°-8° C. (yield 21%).
Workup
- customthe water layer is separated
- extractionthe extracted twice with ether (two 20 ml. portions)
- washwashed with brine (two 10 ml. portions)
- dry with materialdried over magnesium sulfate
- distillationthe solvents distilled at reduced pressure
- customThe (±)6,7-dichloro-2,3-dihydro-2-hydroxymethyl-5-(2-thenoyl)benzofuran is purified by column chromatography on silica gel (95% benzene-5% methanol) and melts at 65°-8° C. (yield 21%)
Sources & evidence
- ORD record
- ord-f56ad51041804d999bf13430cf1082c9
- Source dataset
- uspto-grants-1980_12
- Patent number
- US04237144
Reaction notes
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