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

HRID 14390

反応式

HRID 14390 の反応式
[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]

参加物

8

反応物 4

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

生成物 1

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

試薬・触媒・溶媒 3

HCID 634876Binap, (A+-)-触媒2 回HCID 312751,4-Dioxane溶媒HCID 23716255Sodium bicarbonate methylene chloride溶媒

実験手順

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−Boc).

後処理

  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)

出典と根拠

ORDレコード
ord-1bdf3ad0aecb4fffad466c9a8fc1e468
出典データセット
uspto-grants-2010_06
特許番号
US07732438B2

関連ノート

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