Pseudoephedrine → N-(2-hydroxy-1-methyl-2-phenylethyl)-N-methyl benzeneacetamide

HRID 376019

反応式

HRID 376019 の反応式
[CH3:1][C@H:2]([NH:11][CH3:12])[C@@H:3]([OH:10])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.C(N(CC)CC)C.[C:20]1([CH2:26][C:27](Cl)=[O:28])[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1>O1CCCC1>[OH:10][CH:3]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)[CH:2]([N:11]([CH3:12])[C:27](=[O:28])[CH2:26][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[CH3:1]

参加物

5

反応物 3

HCID 7028PseudoephedrineHCID 7679Phenylacetyl chlorideHCID 8471Triethylamine

生成物 1

HCID 54856748N-(2-hydroxy-1-methyl-2-phenylethyl)-N-methyl benzeneacetamide収率 75%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
0 °C

実験手順

A dry 1 L round-bottomed flask equipped with a magnetic stirrer was charged (+)-pseudoephedrine (13.92 g, 84.26 mmol, 1.0 equiv), triethylamine (13.39 mL, 96.06 mmol, 1.14 mmol), and tetrahydrofuran (340 mL). The solution was cooled to 0° C. and phenylacetyl chloride (14.33 g, 92.69 mmol, 1.1 equiv) was added via cannula over a 20 minute interval as a solution in tetrahydrofuran (90 mL). After 30 minutes, the reaction was quenched with saturated sodium bicarbonate. The amide was extracted from brine (1 L) with ethyl acetate (400 mL, 130 mL, 130 mL), and the organic extracts were dried over sodium sulfate. After removal of the solvent under reduced pressure, a solid was obtained. The solid was recrystallized from 2:1:1 ether/dichloromethane/hexanes (500 mL), affording the phenylacetamide (17.90 g, 75% yield) as a white powder: mp 145°-146° C.; 1H NMR (300 MHz, C6D6) δ6.9-7.5 (m, 10H), 4.55 (br, 1H), 4.48 (t, 1H, J=7.1 Hz), 4.11 (m, 1H), 3.95 (m, 1H), 3.83 (m, 1H), 3.78 (s, 2H), 3.31 (d, 2H, J=1.3 Hz), 2.76 (s, 3H), 2.12 (s, 3H), 0.95 (d, 3H, J=7.0 Hz), 0.42 (d, 3H, J=6.7 Hz); 13C NMR (75.5 MHz, CDCl3) δ173.1, 172.2, 142.2, 141.4, 135.5, 134.5, 128.7, 128.64, 128.58, 128.3, 128.1, 127.5, 126.73, 126.68, 126.6, 126.3, 76.2, 75.3, 58.6, 41.8, 41.4, 33.3, 27.0, 15.0, 14.3; FTIR (neat film) cm-1 3393 (br, m), 1618 (s), 1494 (m), 1453 (m), 1402 (m); HRMS (FAB) Calcd for C18H22NO2 (MH+): 284. 1652. Found: 284.1646.

後処理

  1. customA dry 1 L round-bottomed flask equipped with a magnetic stirrer
  2. customthe reaction was quenched with saturated sodium bicarbonate
  3. extractionThe amide was extracted from brine (1 L) with ethyl acetate (400 mL, 130 mL, 130 mL)
  4. dry with materialthe organic extracts were dried over sodium sulfate
  5. customAfter removal of the solvent under reduced pressure
  6. customa solid was obtained
  7. customThe solid was recrystallized from 2:1:1 ether/dichloromethane/hexanes (500 mL)

出典と根拠

ORDレコード
ord-febc5d645da04ac8b53a1c2e92ce0655
出典データセット
uspto-grants-1996_01
特許番号
US05488131

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