Triphenylphosphine → (2R)-Methyl 2-(tert-butoxycarbonylamino)-(4-((S)-2-methyl-butoxy)-phenyl)acetate

HRID 454996

反応式

HRID 454996 の反応式
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:14]1[CH:19]=[CH:18][C:17]([OH:20])=[CH:16][CH:15]=1)[C:10]([O:12][CH3:13])=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:21][C@@H:22]([CH2:25][CH3:26])[CH2:23]O.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>O1CCCC1>[C:1]([O:5][C:6]([NH:8][C@H:9]([C:14]1[CH:19]=[CH:18][C:17]([O:20][CH2:21][C@@H:22]([CH3:23])[CH2:25][CH3:26])=[CH:16][CH:15]=1)[C:10]([O:12][CH3:13])=[O:11])=[O:7])([CH3:4])([CH3:2])[CH3:3]

参加物

6

反応物 4

HCID 11776TriphenylphosphineHCID 2723602(S)-2-methyl-1-butanolHCID 5363146Diisopropyl azodicarboxylateHCID 10934864Methyl (2R)-2-{[(tert-butoxy)carbonyl]amino}-2-(4-hydroxyphenyl)acetate

生成物 1

HCID 67438449(2R)-Methyl 2-(tert-butoxycarbonylamino)-(4-((S)-2-methyl-butoxy)-phenyl)acetate収率 80%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

A 0° C. solution of (R)-Methyl 2-(tert-butoxycarbonylamino)-2-(4-hydroxyphenyl)acetate (2.8 g, 10 mmol), (S)-2-methyl-1-butanol (1.1 mL, 10 mmol), triphenylphosphine (2.6 g, 10 mmol), and tetrahydrofuran (100 mL) was treated dropwise with diisopropylazodicarboxylate (1.9 mL, 10 mmol) via syringe. The resulting reaction mixture was allowed to warm to room temperature and maintained overnight. The reaction was concentrated and the residue was purified by column chromatography on silica gel (5%-10% ethyl acetate in hexanes) to afford (2R)-Methyl 2-(tert-butoxycarbonylamino)-(4-((S)-2-methyl-butoxy)-phenyl)acetate (2.8 g, 80% yield) as a clear, colorless oil: 1H NMR (400 MHz, CDCl3) δ 7.27 (d, J=7.3 Hz, 2H), 6.88 (d, J=8.6 Hz, 2H), 5.49 (d, J=6.6 Hz, 1H), 5.26 (d, J=7.3 Hz, 1H), 3.81 (dd, J=9.1, 6.1 Hz, 1H), 3.73 (s, 3H), 3.69-3.76 (m, 1H), 1.86 (dq, J=13.1, 6.5 Hz, 1H), 1.52-1.61 (m, 1H), 1.45 (s, 9H), 1.22-1.33 (m, 2H), 1.02 (d, J=6.8 Hz, 3H), 0.95 (t, J=7.5 Hz, 3H); LRMS (ESI) m/e 352.2 [(M+H)+, calcd for C19H30NO5 352.5].

後処理

  1. customThe resulting reaction mixture
  2. temperaturemaintained overnight
  3. concentrationThe reaction was concentrated
  4. customthe residue was purified by column chromatography on silica gel (5%-10% ethyl acetate in hexanes)

出典と根拠

ORDレコード
ord-f8b0fafec7b14b4392a99764911949bc
出典データセット
uspto-grants-2013_07
特許番号
US08497271B2

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