Water → benzyl (5S)-N,N-bis(tert-butoxycarbonyl)-5-(2,3-difluorophenyl)-6-nitro-D-norleucinate

HRID 271926

반응식

HRID 271926 반응식
[C:1]([O:5][C:6]([N:8]([C:27]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28])[C@H:9]([CH2:20][CH2:21]/[CH:22]=[CH:23]/[N+:24]([O-:26])=[O:25])[C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[F:34][C:35]1[C:40]([F:41])=[CH:39][CH:38]=[CH:37][C:36]=1B(O)O.O.C(=O)(O)[O-].[Na+]>O1CCOCC1.C(Cl)Cl.C([O-])(O)=O.[Na+].C1C=CC(P(C2C=CC3C(=CC=CC=3)C=2C2C3C(=CC=CC=3)C=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:1]([O:5][C:6]([N:8]([C:27]([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28])[C@@H:9]([C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11])[CH2:20][CH2:21][C@@H:22]([C:39]1[CH:38]=[CH:37][CH:36]=[C:35]([F:34])[C:40]=1[F:41])[CH2:23][N+:24]([O-:26])=[O:25])=[O:7])([CH3:4])([CH3:3])[CH3:2]

참가 물질

8

반응물 4

HCID 962WaterHCID 516892Sodium BicarbonateHCID 2734333(2,3-Difluorophenyl)boronic acidHCID 25034374benzyl (2R,5E)-2-[bis(tert-butoxycarbonyl)amino]-6-nitrohex-5-enoate

생성물 1

HCID 25034375benzyl (5S)-N,N-bis(tert-butoxycarbonyl)-5-(2,3-difluorophenyl)-6-nitro-D-norleucinate수율 87.4%

시약·촉매·용매 3

HCID 634876Binap, (A+-)-촉매2회HCID 312751,4-Dioxane용매HCID 23716255Sodium bicarbonate methylene chloride용매

실험 절차

A solution of benzyl (2R,5E)-2-[bis(tert-butoxycarbonyl)amino]-6-nitrohex-5-enoate (34.0 g, 73.2 mmol), 2,3-difluorophenylboronic acid (28.9 g, 183.0 mmol) and water (4.62 mL, 256.2 mmol) in dioxane (240 mL) was degassed with argon for 15 min. To this solution was added sodium bicarbonate (3.08 g, 36.6 mmol), (S)-BINAP (1.28 g, 2.05 mmol) and acetylacetanotobis(ethylene)rhodium(I) (0.472 g, 1.83 mmol) . The mixture was stirred at RT for 2 min then heated to 35° C. After 4 h, 255 mg of (S)-BINAP and 94 mg of acetylacetanotobis(ethylene)rhodium(I) were added. After an additional 2 h the reaction was diluted with DCM/NaHCO3, the layers separated and the aqueous phase was backwashed with another portion of DCM. The combined organics were dried over magnesium sulfate, filtered and concentrated to give a residue that was purified by silica gel chromatography (5%→60% ethyl acetate/hexanes) to give the title compound (37.0 g, 87%) contaminated with˜5% 5R isomer. MS 379.1 (M+1-2Boc).

후처리

  1. temperaturethen heated to 35° C
  2. waitAfter 4 h
  3. customthe layers separated
  4. dry with materialThe combined organics were dried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customto give a residue that
  8. customwas purified by silica gel chromatography (5%→60% ethyl acetate/hexanes)

출처 및 근거

ORD 기록
ord-8e8fd32df0cc4b23a0140659f231dbe6
출처 데이터셋
uspto-grants-2008_11
특허 번호
US07452903B2

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