Dicyclohexylcarbodiimide → (1R,2S)-2-{(4-fluoro-benzyl)-[2-(7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1lambda6-benzo[1,2,4]thiadiazin-3-yl)-acetyl]-amino}-cyclopentanecarboxylic acid methyl ester

HRID 731265Notes

Reaction equation

HRID 731265 reaction equation
[CH3:1][O:2][C:3]([C@@H:5]1[CH2:9][CH2:8][CH2:7][C@@H:6]1[NH:10][CH2:11][C:12]1[CH:17]=[CH:16][C:15]([F:18])=[CH:14][CH:13]=1)=[O:4].[CH3:19][S:20]([NH:23][C:24]1[CH:39]=[CH:38][C:27]2[NH:28][C:29]([CH2:34][C:35](O)=[O:36])=[N:30][S:31](=[O:33])(=[O:32])[C:26]=2[CH:25]=1)(=[O:22])=[O:21].C1(N=C=NC2CCCCC2)CCCCC1>ClCCl.CN(C=O)C>[CH3:1][O:2][C:3]([C@@H:5]1[CH2:9][CH2:8][CH2:7][C@@H:6]1[N:10]([CH2:11][C:12]1[CH:17]=[CH:16][C:15]([F:18])=[CH:14][CH:13]=1)[C:35](=[O:36])[CH2:34][C:29]1[NH:28][C:27]2[CH:38]=[CH:39][C:24]([NH:23][S:20]([CH3:19])(=[O:22])=[O:21])=[CH:25][C:26]=2[S:31](=[O:32])(=[O:33])[N:30]=1)=[O:4]

Participants

6

Reactant 3

HCID 10868DicyclohexylcarbodiimideHCID 248585392H-1,2,4-Benzothiadiazine-3-acetic acid, 7-[(methylsulfonyl)amino]-, 1,1-dioxideHCID 57832628methyl (1R,2S)-2-(4-fluoro-benzylamino)-cyclopentanecarboxylate

Product 1

HCID 57671228(1R,2S)-2-{(4-fluoro-benzyl)-[2-(7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1lambda6-benzo[1,2,4]thiadiazin-3-yl)-acetyl]-amino}-cyclopentanecarboxylic acid methyl esterYield 52.4%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent2×

Conditions

Temperature
25 °C

Procedure

(1R,2S)-2-(4-Fluoro-benzylamino)-cyclopentanecarboxylic acid methyl ester (106 mg, 0.42 mmol) and (7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (prepared as described in Example 1j, 140 mg, 0.42 mmol) were dissolved in a 1:1 mixture of dichloromethane and N,N′-dimethylformamide (6 mL). A 1.0 M solution of N,N′-dicyclohexylcarbodiimide in dichloromethane (0.46 mL, 0.46 mmol) was added. The reaction was stirred at 25° C. for 16 h. The mixture was concentrated in vacuo and purified by flash column chromatography (Merck silica gel 60, 40-63 μm; 0-85% ethyl acetate in hexanes) to afford the desired product, (1R,2S)-2-{(4-fluoro-benzyl)-[2-(7-methanesulfonylamino-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetyl]-amino}-cyclopentanecarboxylic acid methyl ester (127 mg, 0.22 mmol, 52%), as a white solid. 1H NMR (400 MHz, CDCl3) δ: 1.80-2.22 (6H, m), 3.07 (3H, s), 3.24 (1H, dd, J1=18.8 Hz, J2=8.0 Hz), 3.32 (1H, dd, J1=15.6 Hz, J2=8.0 Hz), 3.69 (1H, s), 4.63 (2H, d, J=4.8 Hz), 4.67-4.74 (1H, m), 4.82-4.89 (1H, m), 6.99-7.14 (5H, m), 7.51-7.64 (2H, m). LC-MS (ESI) calcd for C24H27FN4O7S2 566.62, found 567.1 [M+H+].

Workup

  1. concentrationThe mixture was concentrated in vacuo
  2. custompurified by flash column chromatography (Merck silica gel 60, 40-63 μm; 0-85% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-802ac78af1ac4a1d914b312dbcbdfa90
Source dataset
uspto-grants-2009_09
Patent number
US07582626B2

Reaction notes

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