Diisopropylethylamine → Rac-4-(2-iodo-5-methanesulfonyl-benzoyl)-3-methyl-piperazine-1-carboxylic acid tert-butyl ester

HRID 32737

Reaction equation

HRID 32737 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][NH:11][CH:10]([CH3:14])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[I:15][C:16]1[CH:24]=[CH:23][C:22]([S:25]([CH3:28])(=[O:27])=[O:26])=[CH:21][C:17]=1[C:18](O)=[O:19].C(N(C(C)C)C(C)C)C.CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F>CN(C)C=O>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:18](=[O:19])[C:17]2[CH:21]=[C:22]([S:25]([CH3:28])(=[O:27])=[O:26])[CH:23]=[CH:24][C:16]=2[I:15])[CH:10]([CH3:14])[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 2756810tert-Butyl 3-methylpiperazine-1-carboxylateHCID 574452812-Iodo-5-methanesulfonyl-benzoic acid

Product 1

HCID 59793735Rac-4-(2-iodo-5-methanesulfonyl-benzoyl)-3-methyl-piperazine-1-carboxylic acid tert-butyl esterYield 47.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of rac-3-Methyl-piperazine-1-carboxylic acid tert-butyl ester (350 mg, 1.75 mmol) in dimethylformamide (3 ml) were added 2-Iodo-5-methanesulfonyl-benzoic acid (540 mg, 1.67 mmol), N-ethyldiisopropylamine (1.8 ml, 10.5 mmol), and TBTU (630 mg, 1.92 mmol). The reaction mixture was then allowed to stir at room temperature for 16 hours. The reaction mixture was then concentrated in vacuo and the residue was purified by column chromatography (SiO2, 20 g, Heptane/EtOAc 0-100%) to give the title compound (400 mg, 45%). MS (m/e): 526.2 (M+NH4+).

Workup

  1. concentrationThe reaction mixture was then concentrated in vacuo
  2. customthe residue was purified by column chromatography (SiO2, 20 g, Heptane/EtOAc 0-100%)

Sources & evidence

ORD record
ord-edf9f4fdab1941119255d8969f0c13db
Source dataset
uspto-grants-2008_09
Patent number
US07427612B2

Linked notes

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