Acetyl chloride → (R)-tert-butyl 8-(acetoxymethyl)-1-isopropyl-7-(methylsulfonyl)-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazine-2(1H)-carboxylate

HRID 1521515ノート

反応式

HRID 1521515 の反応式
[OH:1][CH2:2][C:3]1[C:4]([S:26]([CH3:29])(=[O:28])=[O:27])=[CH:5][C:6]2[N:10]3[CH2:11][CH2:12][N:13]([C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[C@H:14]([CH:15]([CH3:17])[CH3:16])[C:9]3=[N:8][C:7]=2[CH:25]=1.CCN(CC)CC.[C:37](Cl)([CH3:39])=[O:38].CCOC(C)=O>C(Cl)Cl>[C:37]([O:1][CH2:2][C:3]1[C:4]([S:26]([CH3:29])(=[O:27])=[O:28])=[CH:5][C:6]2[N:10]3[CH2:11][CH2:12][N:13]([C:18]([O:20][C:21]([CH3:23])([CH3:24])[CH3:22])=[O:19])[C@H:14]([CH:15]([CH3:16])[CH3:17])[C:9]3=[N:8][C:7]=2[CH:25]=1)(=[O:38])[CH3:39]

参加物

6

反応物 4

HCID 6367Acetyl chlorideHCID 8471TriethylamineHCID 8857Ethyl AcetateHCID 89815566(R)-tert-butyl 8-(hydroxymethyl)-1-isopropyl-7-(methylsulfonyl)-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazine-2(1H)-carboxylate

生成物 1

HCID 89815908(R)-tert-butyl 8-(acetoxymethyl)-1-isopropyl-7-(methylsulfonyl)-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazine-2(1H)-carboxylate収率 81.1%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

To a 50 mL round-bottomed flask containing (R)-tert-butyl 8-(hydroxymethyl)-1-isopropyl-7-(methylsulfonyl)-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazine-2(1H)-carboxylate (236 mg, 0.558 mmol) in CH2Cl2 (5 mL) was added Et3N (169 mg, 1.67 mmol) and AcCl (87 mg, 1.12 mmol) under N2. The mixture was stirred at rt for 10 min. The reaction was quenched with water (20 mL). The aqueous layer was extracted with CH2Cl2 (3×20 mL). The combined organic layers were washed with water (25 mL) and brine, and then dried over anhydrous Na2SO4. The mixture was filtered and the filtrate was evaporated under reduced pressure. The residue was purified by column chromatography on silica gel eluting with PE: EtOAc 8:1-4:1 to give (R)-tert-butyl 8-(acetoxymethyl)-1-isopropyl-7-(methylsulfonyl)-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazine-2(1H)-carboxylate (210 mg, 81.1% yield) as a yellow solid.

後処理

  1. customThe reaction was quenched with water (20 mL)
  2. extractionThe aqueous layer was extracted with CH2Cl2 (3×20 mL)
  3. washThe combined organic layers were washed with water (25 mL) and brine
  4. dry with materialdried over anhydrous Na2SO4
  5. filtrationThe mixture was filtered
  6. customthe filtrate was evaporated under reduced pressure
  7. customThe residue was purified by column chromatography on silica gel eluting with PE

出典と根拠

ORDレコード
ord-4ea56c4a3b164b85bcee2bb3c2560a78
出典データセット
uspto-grants-2015_07
特許番号
US09073931B2

反応ノート

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