Triethylamine → ethyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylate

HRID 358780Notes

Reaction equation

HRID 358780 reaction equation
[CH3:1][O:2][C:3]1[C:4]([O:17][CH3:18])=[CH:5][C:6]2[CH2:12][CH2:11][CH2:10][C:9]([C:13](Cl)=[O:14])=[CH:8][C:7]=2[CH:16]=1.[CH3:19][O:20][C:21]1[CH:22]=[C:23]([CH:37]=[C:38]([O:42][CH3:43])[C:39]=1[O:40][CH3:41])[C:24]([N:26]1[CH2:31][CH2:30][NH:29][CH:28]([C:32]([O:34][CH2:35][CH3:36])=[O:33])[CH2:27]1)=[O:25].C(N(CC)CC)C>ClCCl>[CH3:1][O:2][C:3]1[C:4]([O:17][CH3:18])=[CH:5][C:6]2[CH2:12][CH2:11][CH2:10][C:9]([C:13]([N:29]3[CH2:30][CH2:31][N:26]([C:24](=[O:25])[C:23]4[CH:22]=[C:21]([O:20][CH3:19])[C:39]([O:40][CH3:41])=[C:38]([O:42][CH3:43])[CH:37]=4)[CH2:27][CH:28]3[C:32]([O:34][CH2:35][CH3:36])=[O:33])=[O:14])=[CH:8][C:7]=2[CH:16]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10264946HCID 10264946, compoundHCID 10360649Ethyl 4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylate

Product 1

HCID 11757985ethyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylateYield 77.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 2,3-dimethoxy-6,7-dihydro-5H-benzocycloheptene-8-carbonyl chloride (0.53 g) in dichloromethane (8 ml) is added dropwise, while stirring at 0° C. for 3 minutes, to a mixture of ethyl 4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylate (0.7 g), triethylamine (0.5 g) and dichloromethane (15 ml). The reaction mixture is stirred for 2 hours at room temperature, and then poured into ice-water, followed by extraction with dichloromethane. The organic layer is washed with dilute hydrochloric acid, an aqueous solution of sodium hydrogencarbonate and water, successively, and dried, then the solvent is distilled off under reduced pressure. Crystals obtained from the residue are recrystallized from ethyl acetate and hexane to give ethyl 1-(2,3-dimethoxy-6,7-dihydro-5H-benzocyclohepten-8-ylcarbonyl) -4-(3,4,5-trimethoxybenzoyl)piperazine-2-carboxylate as colorless crystals (0.9 g), m.p. 108-110° C.

Workup

  1. extractionfollowed by extraction with dichloromethane
  2. washThe organic layer is washed with dilute hydrochloric acid
  3. dry with materialan aqueous solution of sodium hydrogencarbonate and water, successively, and dried
  4. distillationthe solvent is distilled off under reduced pressure
  5. customCrystals obtained from the residue
  6. customare recrystallized from ethyl acetate and hexane

Sources & evidence

ORD record
ord-33b4fd1a9c3e40f49817f63929109124
Source dataset
uspto-grants-1991_03
Patent number
US04997836

Reaction notes

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