Triphenylphosphine → (S)-2,4-difluoro-6-(pent-4-en-2-yloxy)benzaldehyde

HRID 921124

反応式

HRID 921124 の反応式
[F:1][C:2]1[CH:9]=[C:8]([F:10])[CH:7]=[C:6]([OH:11])[C:3]=1[CH:4]=[O:5].[CH3:12][C@@H:13](O)[CH2:14][CH:15]=[CH2:16].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1.CCOCC>[F:1][C:2]1[CH:9]=[C:8]([F:10])[CH:7]=[C:6]([O:11][C@H:15]([CH2:14][CH:13]=[CH2:12])[CH3:16])[C:3]=1[CH:4]=[O:5]

参加物

7

反応物 4

HCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 6999724(2R)-pent-4-en-2-olHCID 225079192,4-Difluoro-6-hydroxybenzaldehyde

生成物 1

HCID 118307036(S)-2,4-difluoro-6-(pent-4-en-2-yloxy)benzaldehyde収率 23.72%

試薬・触媒・溶媒 2

HCID 3283Diethyl Ether溶媒HCID 8028Tetrahydrofuran溶媒

実験手順

To a solution of 2,4-difluoro-6-hydroxybenzaldehyde (1.0 g, 6.33 mmol) in THF (14 ml) were added (R)-(−)-pent-4-en-2-ol (1.090 g, 12.65 mmol) and triphenylphosphine (2.157 g, 8.22 mmol). To this mixture was added dropwise DIAD (1.599 ml, 8.22 mmol) (exotherm) and stirred at rt. After 20 h, the mixture was diluted with Et2O and washed with 1N NaOH followed by water (3×'s) then brine, dried (Na2SO4), filtered and concentrated. The crude was purified by flash chromatography (Biotage; 0%-50% EtOAc/hexane; 10 CV) to give (S)-2,4-difluoro-6-(pent-4-en-2-yloxy)benzaldehyde (0.3394 g, 1.500 mmol, 23.72% yield) as a pale yellow oil. 1H NMR (400 MHz, CDCl3) δ: 10.33 (s, 1H), 6.67-6.32 (m, 2H), 6.04-5.63 (m, 1H), 5.32-5.00 (m, 2H), 4.66-4.40 (m, 1H), 2.68-2.28 (m, 2H), 1.41 (d, J=6.1 Hz, 3H).

後処理

  1. washwashed with 1N NaOH
  2. dry with materialdried (Na2SO4)
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe crude was purified by flash chromatography (Biotage; 0%-50% EtOAc/hexane; 10 CV)

出典と根拠

ORDレコード
ord-744f097f0be748be96735efb2daa2075
出典データセット
uspto-grants-2016_03
特許番号
US09273067B2

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