Methyl propiolate → (E)-methyl 3-((3S,6S,7R,8S)-8-benzyl-3-(tert-butoxycarbonylamino)-6-methyl-4-oxo-1,5-dioxonan-7-yloxy)acrylate

HRID 75744

反応式

HRID 75744 の反応式
[CH2:1]([C@@H:8]1[C@@H:16]([OH:17])[C@H:15]([CH3:18])[O:14][C:13](=[O:19])[C@@H:12]([NH:20][C:21](=[O:27])[O:22][C:23]([CH3:26])([CH3:25])[CH3:24])[CH2:11][O:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:28]([O:32][CH3:33])(=[O:31])[C:29]#[CH:30]>C(Cl)Cl.C1N2CCN(CC2)C1>[CH2:1]([C@H:8]1[CH2:9][O:10][CH2:11][C@H:12]([NH:20][C:21]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:27])[C:13](=[O:19])[O:14][C@@H:15]([CH3:18])[C@@H:16]1[O:17]/[CH:30]=[CH:29]/[C:28]([O:32][CH3:33])=[O:31])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

参加物

5

反応物 2

HCID 13536Methyl propiolateHCID 86701245tert-butyl ((3S,7S,8R,9S)-7-benzyl-8-hydroxy-9-methyl-2-oxo-1,5-dioxonan-3-yl)carbamate

生成物 1

HCID 86701238(E)-methyl 3-((3S,6S,7R,8S)-8-benzyl-3-(tert-butoxycarbonylamino)-6-methyl-4-oxo-1,5-dioxonan-7-yloxy)acrylate収率 91.2%

試薬・触媒・溶媒 2

HCID 9237Dabco触媒HCID 6344Dichloromethane溶媒

実験手順

To a solution of tert-butyl ((3S,7S,8R,9S)-7-benzyl-8-hydroxy-9-methyl-2-oxo−1,5-dioxonan-3-yl)carbamate (280 mg, 0.738 mmol, 1.00 equiv) in CH2Cl2 (7.4 mL) were added methyl propiolate (0.098 mL, 1.11 mmol, 1.50 equiv) and DABCO (4 mg, 0.04 mmol, 0.05 equiv). This solution was stirred at room temperature for 1 h, concentrated, and purified by automated silica gel column chromatography (5-25% acetone in hexanes) to provide (E)-methyl 3-(((3S,6S,7R,8S)-8-benzyl-3-((tert-butoxycarbonyl)amino)-6-methyl-4-oxo-1,5-dioxonan-7-yl)oxy)acrylate (312 mg, 91%) as a white solid: mp slow melt from 50-80° C., recrystallized at 98° C., remelt at 128-129° C.; IR (neat film) 3342, 2980, 2949, 1753, 1703, 1639, 1497, 1329, 1132, 910, 731 cm−1; 1H NMR (400 MHz, CDCl3) δ 7.48 (d, J=12.2 Hz, 1H), 7.32-7.27 (m, 2H), 7.23-7.18 (m, 1H), 7.15-7.11 (m, 2H), 5.40 (d, J=12.2 Hz, 1H), 5.10 (d, J=8.3 Hz, 1H), 5.02 (dd, J=9.3, 6.4 Hz, 1H), 4.64 (dd, J=15.3, 7.5 Hz, 1H), 3.92 (dd, J=11.6, 7.6 Hz, 1H), 3.74 (d, J=9.1 Hz, 1H), 3.71 (s, 3H), 3.51 (d, J=11.1 Hz, 1H), 3.43 (dd, J=10.5, 6.4 Hz, 1H), 3.29 (dd, J=11.3, 7.5 Hz, 1H), 2.92 (dd, J=13.8, 3.5 Hz, 1H), 2.34 (t, J=12.5 Hz, 1H), 2.06 (s, 1H), 1.42 (s, 9H), 1.41 (d, J=6.5 Hz, 3H); 13C NMR (100 MHz, CDCl3) δ 172.16, 167.97, 162.94, 154.91, 138.54, 129.09, 128.57, 126.48, 98.50, 89.01, 80.31, 73.94, 72.57, 71.33, 52.70, 51.26, 46.47, 35.18, 28.25, 18.73; HRMS-ESI (m/z) [M+Na]+ calc'd for C24H33NO8Na, 486.2098. found, 486.2104.

後処理

  1. concentrationconcentrated
  2. custompurified by automated silica gel column chromatography (5-25% acetone in hexanes)

出典と根拠

ORDレコード
ord-e266892eddf2426eacbd461f541d60db
出典データセット
uspto-grants-2014_09
特許番号
US08835462B2

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