Ethyl chloroformate → Ethyl 3-(thiophen-2-yl)piperazine-1-carboxylate

HRID 462415노트

반응식

HRID 462415 반응식
Cl[C:2]([O:4][CH2:5][CH3:6])=[O:3].[S:7]1[CH:11]=[CH:10][CH:9]=[C:8]1[CH:12]1[CH2:17][NH:16][CH2:15][CH2:14][NH:13]1.[OH-].[Na+]>C(O)(=O)C>[S:7]1[CH:11]=[CH:10][CH:9]=[C:8]1[CH:12]1[NH:13][CH2:14][CH2:15][N:16]([C:2]([O:4][CH2:5][CH3:6])=[O:3])[CH2:17]1

참가 물질

5

반응물 3

HCID 10928Ethyl chloroformateHCID 14798Sodium HydroxideHCID 27717262-Thiophen-2-yl-piperazine

생성물 1

HCID 2771741Ethyl 3-(thiophen-2-yl)piperazine-1-carboxylate수율 65.7%

시약·촉매·용매 1

HCID 176Acetic Acid용매2회

실험 절차

A solution of ethyl chloroformate (20.4 g, 0.19 mol) in acetic acid (150 ml) is added dropwise with stirring to a solution of 2-(2-thienyl)-piperazine (31.6 g, 0.19 mol; Preparation 1) in acetic acid (150 ml) at 65° C. under an atmosphere of dry nitrogen. After 1 h, the solution is allowed to cool to room temperature, and stirring is maintained for an additional 16 h. The reaction mixture is added to chilled 10N NaOH (750 ml) and ice is added to control the exothermic reaction. The mixture is extracted with methylene chloride (4×300 ml), the organic solution is dried(potassium carbonate), and the solvent removed under reduced pressure to give the carbamate (30.0 g) as a light brown oil. This material is dissolved in methanol (250 ml), and the solution added to a solution of maleic acid (18.6 g; 1 eq) in methanol (250 ml). The mixture is treated with charcoal and the solvent removed under reduced pressure to give an oil which crystallizes on trituration with ethyl acetate. The maleate salt melts at 165°-166° C.

후처리

  1. temperatureis maintained for an additional 16 h
  2. additionThe reaction mixture is added
  3. additionis added
  4. customthe exothermic reaction
  5. extractionThe mixture is extracted with methylene chloride (4×300 ml)
  6. customthe solvent removed under reduced pressure

출처 및 근거

ORD 기록
ord-29f1c506b9c94c22a2803c09e96c29c5
출처 데이터셋
uspto-grants-1985_05
특허 번호
US04515792

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