Triethyl 2-phosphonopropionate → Ethyl 2-(oxetan-3-ylidene)propanoate

HRID 63535

反応式

HRID 63535 の反応式
[CH3:1][CH2:2][O:3][C:4]([CH:6](P(OCC)(OCC)=O)[CH3:7])=[O:5].CC(C)([O-])C.[K+].[O:22]1[CH2:25][C:24](=O)[CH2:23]1>C1COCC1>[O:22]1[CH2:25][C:24](=[C:6]([CH3:7])[C:4]([O:3][CH2:2][CH3:1])=[O:5])[CH2:23]1

参加物

5

反応物 3

HCID 107155Triethyl 2-phosphonopropionateHCID 150242543-OxetanoneHCID 23665647Potassium tert-butoxide

生成物 1

HCID 86698951Ethyl 2-(oxetan-3-ylidene)propanoate収率 31.2%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

To a solution of triethyl 2-phosphonopropionate (800 mg, 3.4 mmol) in anhydrous THF (3 mL) was added potassium tert-butoxide (340 mg, 3.1 mmol). The reaction was stirred for 1 h at RT then oxetan-3-one (CAS-RN 6704-31-0, available from commercial suppliers, 220 mg, 3.1 mmol) was added in a single portion. The reaction was heated at reflux for 20 h then cooled to RT and adsorbed onto silica gel. Purification by automated column chromatography (Biotage SP4) on silica gel (12 g Grace cartridges) eluting with EtOAc: n-heptane (gradient elution, 0% (equil., 5 CV), 0% (5 CV) 0-100% (25CV), 100% (10 CV)) afforded (i) (151 mg, 31%).

後処理

  1. temperatureThe reaction was heated
  2. temperatureat reflux for 20 h
  3. temperaturethen cooled to RT
  4. customPurification by automated column chromatography (Biotage SP4) on silica gel (12 g Grace cartridges)
  5. washeluting with EtOAc

出典と根拠

ORDレコード
ord-4a2e1962d9dd476fb4ececdb1806cb14
出典データセット
uspto-grants-2016_09
特許番号
US09447080B2

関連ノート

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