Water → (2R,3S)-3-acetamido-N-tert-butyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)tetrahydrofuran-3-carboxamide

HRID 61350

Reaktionsgleichung

Reaktionsgleichung von HRID 61350
[C:1]([NH:4][C@@:5]1([C:13]([NH:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8][O:7][C@@H:6]1[CH2:10][CH:11]=[CH2:12])(=[O:3])[CH3:2].[CH3:20][C:21]1([CH3:28])[C:25]([CH3:27])([CH3:26])[O:24][BH:23][O:22]1.O>ClCCl.[Ir+].ClC1CCC=CCCC=1.C1(P(C2C=CC=CC=2)CCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[C:1]([NH:4][C@@:5]1([C:13]([NH:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8][O:7][C@@H:6]1[CH2:10][CH2:11][CH2:12][B:23]1[O:24][C:25]([CH3:27])([CH3:26])[C:21]([CH3:28])([CH3:20])[O:22]1)(=[O:3])[CH3:2]

Komponenten

7

Edukt 3

HCID 962WaterHCID 27347684,4,5,5-Tetramethyl[1,3,2]dioxaborolaneHCID 67513020(2R,3S)-3-acetamido-2-allyl-N-tert-butyltetrahydrofuran-3-carboxamide

Produkt 1

HCID 67516397(2R,3S)-3-acetamido-N-tert-butyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)tetrahydrofuran-3-carboxamideAusbeute 63 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 742671,2-Bis(diphenylphosphino)ethaneKatalysatorHCID 178478077HCID 178478077, VerbindungKatalysatorHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A solution of (2R,3S)-3-acetamido-2-allyl-N-tert-butyltetrahydrofuran-3-carboxamide (930 mg, 3.47 mmol) in dichloromethane (20 mL), was treated with chloro-1,5-cyclooctadiene iridium(I) dimer (70 mg, 3 mol %) and 1,2-bis(diphenylphosphino)-ethane (83 mg, 6 mol %). The solution was stirred at room temperature for 30 minutes and then 4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (1.01 mL, 6.94 mmol) was added dropwise, and the reaction was stirred overnight at room temperature. The next day, the reaction mixture was poured into water and the aqueous solution was extracted using ethyl acetate (3×). The combined organic layers were washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, filtered and concentrated. Purification by flash column chromatography (silica gel, 50-80% ethyl acetate in dichloromethane) gave (2R,3S)-3-acetamido-N-tert-butyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)propyl)tetrahydrofuran-3-carboxamide as a colorless oil (864 mg, 63%). 1H NMR (CDCl3, 300 MHz) δ 7.01 (s, NH, 1 H), 6.10 (s, NH, 1 H), 4.38 (m, 1 H), 4.12 (m, 1 H), 4.00 (m, 1 H), 2.96 (m, 1 H), 2.02-2.18 (m, 2 H), 1.99 (s, 3 H), 1.42-1.62 (m, 3 H), 1.36 (s, 9 H), 1.22 (s, 12 H), 0.76 (m, 2 H); MS (+CI): m/z for C20H37BN2O5: expected 396.3; found 397.4 (M+H)+.

Aufarbeitung

  1. stirringthe reaction was stirred overnight at room temperature
  2. extractionthe aqueous solution was extracted
  3. washThe combined organic layers were washed with saturated aqueous sodium chloride
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customPurification by flash column chromatography (silica gel, 50-80% ethyl acetate in dichloromethane)

Quellen und Nachweise

ORD-Eintrag
ord-30dddbacdf6349fcbfcc3591eae9ad6e
Quelldatensatz
uspto-grants-2016_09
Patentnummer
US09440995B2

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