Triethylamine → HCID 21428591, compound

HRID 437547Notes

Reaction equation

HRID 437547 reaction equation
[C:1]1([CH:7]([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[N:8]2[CH2:13][CH2:12][NH:11][C:10]([CH3:25])([CH2:14][C:15]3[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[C:17]([O:23][CH3:24])[CH:16]=3)[CH2:9]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(N(CC)CC)C.[CH2:39]([O:41][C:42](Cl)=[O:43])[CH3:40]>C1(C)C=CC=CC=1>[C:26]1([CH:7]([C:1]2[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=2)[N:8]2[CH2:13][CH2:12][N:11]([C:42]([O:41][CH2:39][CH3:40])=[O:43])[C:10]([CH3:25])([CH2:14][C:15]3[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[C:17]([O:23][CH3:24])[CH:16]=3)[CH2:9]2)[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 10928Ethyl chloroformateHCID 21428563HCID 21428563, compound

Product 1

HCID 21428591HCID 21428591, compoundYield 94%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent2×

Procedure

21.6 g of 1-diphenylmethyl-3-methyl-3-(3,4-dimethoxybenzyl)-piperazine (cf. Example 2) are dissolved with 5.2 g of triethylamine in 200 ml of dry toluene. Then a solution of 5.4 g of chloroformic acid ethyl ester in 50 ml of toluene is added dropwise with stirring. Thereafter, the mixture is stirred for a further 2 hours. After filtration, the filtrate is washed free of halide with water and evaporated to dryness. A yellowish oil, which is recrystallized from diisopropyl ether, is obtained as the residue. 22.7 g (94 percent of theory) of 1-diphenylmethyl-3-methyl-3-(3,4-dimethoxybenzyl)-4-carbethoxy-piperazine are obtained. m.p. = 113° C.

Workup

  1. stirringThereafter, the mixture is stirred for a further 2 hours
  2. filtrationAfter filtration
  3. washthe filtrate is washed free of halide with water
  4. customevaporated to dryness
  5. customA yellowish oil, which is recrystallized from diisopropyl ether
  6. customis obtained as the residue

Sources & evidence

ORD record
ord-33fa3940eeec4c4d891e9a011ec4f29a
Source dataset
uspto-grants-1977_06
Patent number
US04031216

Reaction notes

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