4-Toluenesulfonyl chloride → N-(Benzyloxycarbonyl)-trans-4-tosyloxy-L-proline ethyl ester

HRID 1586101노트

반응식

HRID 1586101 반응식
[CH2:1]([O:3][C:4](=[O:21])[C@@H:5]1[CH2:9][C@@H:8]([OH:10])[CH2:7][N:6]1[C:11]([O:13][CH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[O:12])[CH3:2].[C:22]1([CH3:32])[CH:27]=[CH:26][C:25]([S:28](Cl)(=[O:30])=[O:29])=[CH:24][CH:23]=1>C(Cl)(Cl)Cl.C(Cl)Cl.N1C=CC=CC=1>[CH2:1]([O:3][C:4](=[O:21])[C@@H:5]1[CH2:9][C@@H:8]([O:10][S:28]([C:25]2[CH:26]=[CH:27][C:22]([CH3:32])=[CH:23][CH:24]=2)(=[O:30])=[O:29])[CH2:7][N:6]1[C:11]([O:13][CH2:14][C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1)=[O:12])[CH3:2]

참가 물질

6

반응물 2

HCID 73974-Toluenesulfonyl chlorideHCID 146545901-Benzyl 2-ethyl (2S,4R)-4-hydroxypyrrolidine-1,2-dicarboxylate

생성물 1

HCID 14804601N-(Benzyloxycarbonyl)-trans-4-tosyloxy-L-proline ethyl ester

시약·촉매·용매 3

HCID 1049Pyridine용매2회HCID 6212Chloroform용매HCID 6344Dichloromethane용매

실험 절차

To a solution of N-CBZ-trans-4-hydroxy-L-proline ethyl ester (5.6 g, 19 mmol) and anhydrous pyridine (4.6 mL, 4.5 g, 57 mmol) in CHCl3 (30 mL) was added p-toluenesulfonyl chloride (7.2 g, 38 mmol) in one portion. After stirring at room temperature for 72 h, the reaction was diluted with CH2Cl2 (70 mL) and pyridine removed by repeated extraction with 10% HCl (4×10 mL). The organic layer was dried (MgSO4) and concentrated to a golden oil which was purified by silica gel flash chromatography (gradient elution, using 1:1, 2:1 ethyl ether-petroleum ether) to yield 8.2 g (98%) of pure 2 as a colorless oil: TLC Rf 0.27 (3:3:1 ethyl ether-petroleum ether-CH2CL2); [α]24D -29° (c 1.5, CHCl3); 1H NMR (250 MHz, CDCl3 δ 7.79-7.74 (m, 2 H), 7.37-7.26 (m, 7 H), 5.18-5.00 (m, 3H, phCH2 and H-4), 4.44 (app q, J=7.5 Hz, 1 H, H-2), 4.19-3.99 (q, J=7.1 Hz, 2H, CO2CH2CH3, two rotamers), 3.76-3.60 (m, 2 H, H-5), 2.62-2.38 (m, 1 H, H-3), 2.45+2.43 (s, 3 H, PhCH3), 2.23-2.08 (m, 1 H, H-3), 1.25+1.08 (t, J=7.1 Hz, 3 H, CO2CH2CH3); 13C NMR (75.5 MHz, CDCl3) δ 171.59, 171.39, 154.12, 153.64, 145.10, 135.96, 135.81, 133.14, 133.08, 129.88, 129.86, 128.25, 128.17, 127.85, 127.60, 127.48, 78.66, 78.00, 67.14, 67.11, 61.25, 61.17, 57.39, 57.07, 52.25, 51.87, 36.99, 35.86, 21.41, 13.84, 13.69; IR (CHCl3) 1740, 1705, 1420, 1355, 1175 cm-1 ; LRMS (EI, 70 eV) m/e 447 (M+, 0.23), 374 (2), 202 (2), 158 (24), 91 (100); HRMS (EI, 40 eV) m/e 447.1337 (447.1351 calcd for C22H25NO7S).

후처리

  1. customremoved
  2. extractionextraction with 10% HCl (4×10 mL)
  3. dry with materialThe organic layer was dried (MgSO4)
  4. concentrationconcentrated to a golden oil which
  5. customwas purified by silica gel flash chromatography (gradient elution, using 1:1, 2:1 ethyl ether-petroleum ether)

출처 및 근거

ORD 기록
ord-4ebc49bd5fe747c4bfc31a6dc6fff7d1
출처 데이터셋
uspto-grants-1999_08
특허 번호
US05942537

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