Tetrahydrofuran → 4-(3-Chloro-1,4-dihydro-1,4-dioxo-2-naphthalenyl)-1-piperazinecarboxylic acid, 2-methylpropyl ester

HRID 1788906

Reaction equation

HRID 1788906 reaction equation
[Cl:1][C:2]1[C:11](=[O:12])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:13])[C:3]=1[N:14]1[CH2:19][CH2:18][NH:17][CH2:16][CH2:15]1.Cl[C:21]([O:23][CH2:24][CH2:25][CH2:26]C)=[O:22].O1CCC[CH2:29]1>>[Cl:1][C:2]1[C:11](=[O:12])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:13])[C:3]=1[N:14]1[CH2:19][CH2:18][N:17]([C:21]([O:23][CH2:24][CH:25]([CH3:26])[CH3:29])=[O:22])[CH2:16][CH2:15]1

Participants

4

Reactant 3

HCID 8028Tetrahydrofuran2×HCID 61140Butyl chloroformateHCID 6997941,4-Naphthalenedione, 2-chloro-3-(1-piperazinyl)-

Product 1

HCID 139347664-(3-Chloro-1,4-dihydro-1,4-dioxo-2-naphthalenyl)-1-piperazinecarboxylic acid, 2-methylpropyl ester

Procedure

A solution of 830 mg of 3-chloro-2-piperazinyl-1,4-naphthoquinone in 50 ml of tetrahydrofuran was added dropwise to a solution of 0.39 ml of butyl chloroformate in 10 ml of tetrahydrofuran. This mixture was stirred for 20 minutes, then filtered and the filtrate concentrated to an oil. The oil was recrystallized from ether/hexane, giving 360 mg of the desired product, mp 92°-94° C.

Workup

  1. filtrationfiltered
  2. concentrationthe filtrate concentrated to an oil
  3. customThe oil was recrystallized from ether/hexane

Sources & evidence

ORD record
ord-da7582724371467fa51419dee56b16ee
Source dataset
uspto-grants-1987_08
Patent number
US04686220

Linked notes

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