Chlorotrimethylsilane → HCID 178451314, 화합물

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[OH:1][N:2]=[C:3]([C:11](=[O:13])[CH3:12])[C:4]([O:6][C:7]([CH3:10])([CH3:9])[CH3:8])=[O:5].C(N(CC)CC)C.[Cl:21][Si](C)(C)C>C(#N)C>[Cl:21][CH2:12][C:11](=[O:13])[C:3](=[N:2][OH:1])[C:4]([O:6][C:7]([CH3:9])([CH3:8])[CH3:10])=[O:5]

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온도: -30 °C

실험 절차

In 15 ml of acetonitrile was dissolved 1.07 g of tert-butyl 2-hydroxyimino-3-oxobutyrate, followed by addition of 2.8 ml of triethylamine. Then, 2.5 ml of chlorotrimethylsilane was added dropwise with ice-cooling and the mixture was stirred at 20°-25° C. for 1.5 hours, after which it was concentrated under reduced pressure. The residue was suspended in 15 ml of tetrahydrofuran and the suspension was filtered in a nitrogen gas stream to remove insolubles. This filtrate containing tert-butyl 2-trimethylsilyloxyimino-3-trimethylsilyloxy-3-butenoate was cooled to -30° C. and 0.46 ml of sulfuryl chloride was added dropwise. After the temperature of the system was increased to 20° C., the reaction mixture was concentrated under reduced pressure. The concentrate was chromatographed on a silica gel column and elution was carried out with 100 ml of hexane-ether (1:1, v/v). The eluate was concentrated under reduced pressure to give 1.08 g of tert-butyl 4-chloro-2-hydroxyimino-3-oxobutyrate. Yield 85.2%.