2-Dimethylaminopyridine → N-(2-amino-5-iodobenzoyl)-beta-alanine benzyl ester

HRID 1655686ノート

反応式

HRID 1655686 の反応式
[I:1][C:2]1[CH:13]=[C:6]2[C:7](OC(=O)[NH:11][C:5]2=[CH:4][CH:3]=1)=[O:8].S(C1C=CC(C)=CC=1)(O)(=O)=O.[CH2:25]([O:32][C:33](=[O:37])[CH2:34][CH2:35][NH2:36])[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.CN(C1C=CC=CN=1)C>N1C=CC=CC=1>[CH2:25]([O:32][C:33](=[O:37])[CH2:34][CH2:35][NH:36][C:7](=[O:8])[C:6]1[CH:13]=[C:2]([I:1])[CH:3]=[CH:4][C:5]=1[NH2:11])[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1

参加物

5

反応物 3

HCID 218852-DimethylaminopyridineHCID 2944806-iodo-2H-3,1-benzoxazine-2,4(1H)-dioneHCID 135021004-Methylbenzene-1-sulfonic acid--benzyl beta-alaninate (1/1)

生成物 1

HCID 22905047N-(2-amino-5-iodobenzoyl)-beta-alanine benzyl ester収率 25.2%

試薬・触媒・溶媒 1

HCID 1049Pyridine溶媒

実験手順

a magnetically stirred solution of 5 grams of 5-iodoisatoic anhydride (0.0173 mol), 5.85 grams of β-alanine benzyl ester tosylate (0.0173 mol), 35 mL pyridine, and 0.5 of dimethylaminopyridine (0.0041 mol) was heated to 80° C. for 2 hrs. The reaction mixture was allowed to cool to room temperature and concentrated in vacuo. The resulting residue was dissolved in 100 mL ethyl acetate and washed 2×50 mL of 10% cupric sulfate, 1×50 mL sat. sodium bicarbonate, 1×50 mL brine, dried over sodium sulfate, filtered and concentrated in vacuo. The product was further purified by column chromatography, using silica gel, eluting with a 1:1 mixture of ethyl acetate and hexane (TLC, SiO2, 1:1 EtOAc/hexane, Rf =0.65, υν positive) to yield 1.85 grams (25%) of N-(2-amino-5-iodobenzoyl)-β-alanine benzyl ester. 1H NMR (CDCl3, δTMS) 7.54 (1H, d, 4JHH =2 Hz, Ar--H, o-CON), 7.42 (1H, dd, 3JHH =9 Hz, 4JHH =2 Hz, Ar--H p-CON), 7.38-7.32 (5H, s, ArH Ph), 6.65 (1H, bt, 3JHH =6 Hz, CONH), 6.46 (1H, d, 3JHH =9 Hz, Ar--H m-CON), 5.16 (2H, s, OCH2), 3.68 (2H, q, 3JHH 6 Hz, NCH2), 2.69 (2H, t, 3JHH =6 Hz, CH2CO2). 13C NMR (CDCl3, δTMS) 172.4, 167.8, 148.6, 140.6, 135.6, 135.5, 128.7, 128.4, 128.3, 119.3, 118.1, 76.3, 66.7, 35.2, 34.0.

後処理

  1. concentrationconcentrated in vacuo
  2. dissolutionThe resulting residue was dissolved in 100 mL ethyl acetate
  3. washwashed 2×50 mL of 10% cupric sulfate, 1×50 mL sat. sodium bicarbonate, 1×50 mL brine
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe product was further purified by column chromatography
  8. washeluting with a 1:1 mixture of ethyl acetate and hexane (TLC, SiO2, 1:1 EtOAc/hexane, Rf =0.65, υν positive)

出典と根拠

ORDレコード
ord-9e9d66d97c2745f193c0f00da1058ce5
出典データセット
uspto-grants-1993_10
特許番号
US05250679

反応ノート

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