Water → 4-[6-chloro-4-(3-methanesulfonyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazin-8-yl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 388279Notes

Reaction equation

HRID 388279 reaction equation
[CH3:1][S:2]([C:5]1[CH:6]=[C:7]([S:11](Cl)(=[O:13])=[O:12])[CH:8]=[CH:9][CH:10]=1)(=[O:4])=[O:3].[C:15]([O:19][C:20]([N:22]1[CH2:27][CH2:26][N:25]([C:28]2[C:37]3[O:36][CH2:35][CH2:34][NH:33][C:32]=3[CH:31]=[C:30]([Cl:38])[CH:29]=2)[CH2:24][CH2:23]1)=[O:21])([CH3:18])([CH3:17])[CH3:16].N1C=CC=CC=1.O>ClCCl>[C:15]([O:19][C:20]([N:22]1[CH2:23][CH2:24][N:25]([C:28]2[C:37]3[O:36][CH2:35][CH2:34][N:33]([S:11]([C:7]4[CH:8]=[CH:9][CH:10]=[C:5]([S:2]([CH3:1])(=[O:4])=[O:3])[CH:6]=4)(=[O:13])=[O:12])[C:32]=3[CH:31]=[C:30]([Cl:38])[CH:29]=2)[CH2:26][CH2:27]1)=[O:21])([CH3:18])([CH3:16])[CH3:17]

Participants

6

Reactant 4

HCID 962WaterHCID 1049PyridineHCID 2203303-(Methylsulfonyl)benzenesulfonyl chlorideHCID 207656884-(6-chloro-3,4-dihydro-2H-benzo[1,4]oxazin-8-yl)-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 690664394-[6-chloro-4-(3-methanesulfonyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazin-8-yl]-piperazine-1-carboxylic acid tert-butyl esterYield 92%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

3-Methanesulfonyl-benzenesulfonyl chloride (80 mg, 0.314 mmol) was added in small portions under nitrogen to an ice-cold solution of 4-(6-chloro-3,4-dihydro-2H-benzo[1,4]oxazin-8-yl)-piperazine-1-carboxylic acid tert-butyl ester (101 mg, 0.285 mmol) and pyridine (50 mg, 0.628 mmol) in dichlormethane (2 mL). After 1.5 hours at ambient temperature, water was added. The layers were separated and the organic phase was washed with saturated aqueous solution of sodium bicarbonate (20 mL), dried (Na2SO4) and concentrated to give 4-[6-chloro-4-(3-methanesulfonyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazin-8-yl]-piperazine-1-carboxylic acid tert-butyl ester as an oil (150 mg, 91%).

Workup

  1. customThe layers were separated
  2. washthe organic phase was washed with saturated aqueous solution of sodium bicarbonate (20 mL)
  3. dry with materialdried (Na2SO4)
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-3c6056dbc33249ffbb9c450021d2a47a
Source dataset
uspto-grants-2013_02
Patent number
US08377931B2

Reaction notes

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