Formaldehyde → ((2-Chloro-5-[5-(3-chlorothiophene-2-yl)-[1,2,4]oxadiazol-3-yl]-phenyl}-methylamino)-acetic acid ethyl ester

HRID 2250470ノート

反応式

HRID 2250470 の反応式
[CH2:1]([O:3][C:4](=[O:25])[CH2:5][NH:6][C:7]1[CH:12]=[C:11]([C:13]2[N:17]=[C:16]([C:18]3[S:19][CH:20]=[CH:21][C:22]=3[Cl:23])[O:15][N:14]=2)[CH:10]=[CH:9][C:8]=1[Cl:24])[CH3:2].C=O.[C:28]([BH3-])#N.[Na+].[OH-].[Na+]>C(O)(=O)C>[CH2:1]([O:3][C:4](=[O:25])[CH2:5][N:6]([C:7]1[CH:12]=[C:11]([C:13]2[N:17]=[C:16]([C:18]3[S:19][CH:20]=[CH:21][C:22]=3[Cl:23])[O:15][N:14]=2)[CH:10]=[CH:9][C:8]=1[Cl:24])[CH3:28])[CH3:2]

参加物

6

反応物 4

HCID 712FormaldehydeHCID 14798Sodium HydroxideHCID 5003444Sodium cyanoborohydrideHCID 16222810(2-Chloro-5-[5-(3-chlorothiophene-2-yl)-[1,2,4]oxadiazol-3-yl]-phenylamino)-acetic acid ethyl ester

生成物 1

HCID 16222813((2-Chloro-5-[5-(3-chlorothiophene-2-yl)-[1,2,4]oxadiazol-3-yl]-phenyl}-methylamino)-acetic acid ethyl ester収率 97.2%

試薬・触媒・溶媒 1

HCID 176Acetic Acid溶媒

実験手順

To a yellow mixture of (2-chloro-5-[5-(3-chlorothiophene-2-yl)-[1,2,4]oxadiazol-3-yl]-phenylamino)-acetic acid ethyl ester (0.360 g, 0.903 mmol), paraformaldehyde (0.271 g, 9.03 mmol) and glacial acetic acid (4.5 mL) was added sodium cyanoborohydride (0.284 g, 4.51 mmol) in small portions over 5 min. The yellow mixture became a white suspension and was stirred overnight at room temperature. The white suspension was added to a 25% NaOH(aq) solution at 0° C. The aqueous layer was extracted with dichloromethane (50 mL), washed with brine (15 mL), dried over MgSO4, filtered and concentrated in vacuo. The clear oil was purified by flash column chromatography (silica gel, elution with EtOAc:hexanes, 1:5) to yield 0.362 g (96%) of the title compound as a white solid. 1H NMR (CDCl3): 7.94 (d, 1H, J=1.7 Hz), 7.73 (td, 1H, J=8.2, 1.9 and 1.7 Hz), 7.61 (dd, 1H, J=5.5, 5.2, 1.6 and 1.4 Hz), 7.45 (dd, 1H, J=8.5 and 1.4 Hz), 7.13 (dd, 1H, J=5.5, 5.2, 1.6 and 1.4 Hz), 4.18 (q, 2H, J=7.1 Hz), 4.04 (s, 2H), 3.07 (s, 3H), 1.26 (t, 3H, J=7.1 Hz).

後処理

  1. extractionThe aqueous layer was extracted with dichloromethane (50 mL)
  2. washwashed with brine (15 mL)
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customThe clear oil was purified by flash column chromatography (silica gel, elution with EtOAc:hexanes, 1:5)

出典と根拠

ORDレコード
ord-9fbae5dfa2854bf0b964b1b619ddbb62
出典データセット
uspto-grants-2008_01
特許番号
US07317029B2

反応ノート

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