Triphenylphosphine → 4-(N-t-Butoxycarbonyl-4-piperidinyloxy)-2-hydroxybenzoic acid methyl ester

HRID 128580

반응식

HRID 128580 반응식
[OH:1][C:2]1[CH:11]=[C:10]([OH:12])[CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[C:32]([N:39]1[CH2:44][CH2:43][CH:42](O)[CH2:41][CH2:40]1)([O:34][C:35]([CH3:38])([CH3:37])[CH3:36])=[O:33].N(C(OCC)=O)=NC(OCC)=O>C1COCC1.C(OCC)(=O)C>[OH:1][C:2]1[CH:11]=[C:10]([O:12][CH:42]2[CH2:43][CH2:44][N:39]([C:32]([O:34][C:35]([CH3:38])([CH3:37])[CH3:36])=[O:33])[CH2:40][CH2:41]2)[CH:9]=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5]

참가 물질

7

반응물 4

HCID 11776TriphenylphosphineHCID 16523Methyl 2,4-DihydroxybenzoateHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 643502Tert-butyl 4-hydroxypiperidine-1-carboxylate

생성물 1

HCID 105940774-(N-t-Butoxycarbonyl-4-piperidinyloxy)-2-hydroxybenzoic acid methyl ester

시약·촉매·용매 2

HCID 8028Tetrahydrofuran용매2회HCID 8857Ethyl Acetate용매

실험 절차

Methyl 2,4-dihydroxybenzoate (5.1 g, 30.33 mmol) and triphenylphosphine (9.52 g, 36.3 mmol) were stirred in THF (200 ml) under nitrogen. The mixture was cooled in an ice bath and treated with a solution of 1-Boc-4-hydroxypiperidine (6.8 g, 33.8 mmol) and diethyl azodicarboxylate (5.73 ml, 6.34 g, 36.4 mmol) in THF (100 ml) added dropwise over 30 min. The mixture was stirred at ambient temperature for 18 hours, then diluted with ethyl acetate and washed with 1M NaOH, saturated aqueous sodium bicarbonate, and brine. The organic layer was dried over sodium sulfate, filtered, and evaporated to dryness in vacuo. The residue was chromatographed on silica gel eluted with 10% ethyl acetate in hexane, and the product fractions were evaporated to dryness in vacuo to give methyl 2-hydroxy-4-(1-Boc-4-piperidyloxy)benzoate.

후처리

  1. temperatureThe mixture was cooled in an ice bath
  2. additionadded dropwise over 30 min
  3. washwashed with 1M NaOH, saturated aqueous sodium bicarbonate, and brine
  4. dry with materialThe organic layer was dried over sodium sulfate
  5. filtrationfiltered
  6. customevaporated to dryness in vacuo
  7. customThe residue was chromatographed on silica gel
  8. washeluted with 10% ethyl acetate in hexane
  9. customthe product fractions were evaporated to dryness in vacuo

출처 및 근거

ORD 기록
ord-af4ac323a6bb404982f614c0b175dfe1
출처 데이터셋
uspto-grants-1995_11
특허 번호
US05464788

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