Triethylamine → 5-Methyl-3-(3,3,3-trifluoro-2-methoxy-2-phenyl-propionyl oxymethyl)-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid methyl ester

HRID 919009

反応式

HRID 919009 の反応式
[CH3:1][O:2][C:3]([C:5]1[CH:16]=[CH:15][C:8]2[O:9][CH2:10][CH:11]([CH2:13][OH:14])[O:12][C:7]=2[C:6]=1[CH3:17])=[O:4].C(N(CC)CC)C.[CH3:25][O:26][C@:27]([C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1)([C:31]([F:34])([F:33])[F:32])[C:28](Cl)=[O:29]>C(Cl)Cl>[CH3:1][O:2][C:3]([C:5]1[CH:16]=[CH:15][C:8]2[O:9][CH2:10][CH:11]([CH2:13][O:14][C:28](=[O:29])[C:27]([O:26][CH3:25])([C:35]3[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=3)[C:31]([F:33])([F:34])[F:32])[O:12][C:7]=2[C:6]=1[CH3:17])=[O:4]

参加物

5

反応物 3

HCID 8471TriethylamineHCID 3080792(-)-alpha-Methoxy-alpha-(trifluoromethyl)phenylacetyl chloride2 回HCID 687788313-Hydroxymethyl-5-methyl-2,3-dihydrobenzo[1,4]dioxine-6-carboxylic acid methyl ester

生成物 1

HCID 687829545-Methyl-3-(3,3,3-trifluoro-2-methoxy-2-phenyl-propionyl oxymethyl)-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid methyl ester

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒2 回

実験手順

To a round bottom flask equipped with magnetic stirring and a nitrogen inlet was added 3-hydroxymethyl-5-methyl-2,3-dihydrobenzo[1,4]dioxine-6-carboxylic acid methyl ester (0.10 g, 0.44 mmol) and dry methylene chloride (1.5 mL). The mixture was cooled in an ice bath and triethylamine (0.12 mL, 0.87 mmol) was added followed by (R)-(−)-α-methoxy-α-trifluoromethylphenylacetyl chloride (0.09 mL, 0.48 mmol). The mixture was stirred for 2 hours at which point TLC showed the reaction to be incomplete. More (R)-(−)-α-methoxy-α-trifluoromethylphenylacetyl chloride (0.09 mL, 0.48 mmol) was added and the reaction was allowed to stir 1 hour at room temperature. The mixture was diluted with methylene chloride, washed once with 1N HCl, once with saturated sodium bicarbonate, dried over magnesium sulfate, filtered and evaporated. The residue was chromatographed on silica gel eluting with methylene chloride to give a clear oil, 5-methyl 3-(3,3,3-trifluoro-2-methoxy-2-phenyl-propionyloxymethyl)-2,3-dihydro-benzo[1,4]dioxine-6-carboxylic acid methyl ester, for which a yield was not determined. 1H-NMR (300 MHz, CD3COCD3) δ (ppm): 2.38 (s, 3H), 3.58 (s, 3H), 3.81 (s, 3H), 4.10 (m, 1H), 4.48 (dd, 1H), 4.65 (m, 2H), 4.86 (m, 1H) 6.78 (d, 1H) 7.47 (m, 5H), 7.60 (d, 1H); 19F-NMR (300 MHz, CD3COCD3) δ (ppm): −72.89 (s); both 1H- and 19F-NMR indicate the presence of only one stereo- and regioisomer; TLC: Rf=0.62 (1:1 ethyl acetate/hexane).

後処理

  1. customTo a round bottom flask equipped
  2. temperatureThe mixture was cooled in an ice bath
  3. stirringThe mixture was stirred for 2 hours at which point TLC
  4. customthe reaction
  5. stirringto stir 1 hour at room temperature
  6. washwashed once with 1N HCl, once with saturated sodium bicarbonate
  7. dry with materialdried over magnesium sulfate
  8. filtrationfiltered
  9. customevaporated
  10. customThe residue was chromatographed on silica gel eluting with methylene chloride

出典と根拠

ORDレコード
ord-dcb5ab3c4b134c519dd93c070be34cfd
出典データセット
uspto-grants-2016_03
特許番号
US09272986B2

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