Phenylsilane → 5-(3,3-dimethyl-but-1-ynyl)-3-(N-tert-butoxycarbonyl-piperidin-4-yl)amino-thiophene-2-carboxylic acid methyl ester

HRID 244918Notes

Reaction equation

HRID 244918 reaction equation
[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]([C:11]#[C:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[CH:8][C:9]=1[NH2:10])=[O:4].[C:17]([O:21][C:22]([N:24]1[CH2:29][CH2:28][C:27](=O)[CH2:26][CH2:25]1)=[O:23])([CH3:20])([CH3:19])[CH3:18].C1([SiH3])C=CC=CC=1>C1COCC1.C(Cl)Cl.C([Sn](Cl)(Cl)CCCC)CCC>[CH3:1][O:2][C:3]([C:5]1[S:6][C:7]([C:11]#[C:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[CH:8][C:9]=1[NH:10][CH:27]1[CH2:28][CH2:29][N:24]([C:22]([O:21][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:23])[CH2:25][CH2:26]1)=[O:4]

Participants

7

Reactant 3

HCID 12752Phenylsilane2×HCID 735900tert-Butyl 4-oxopiperidine-1-carboxylate2×HCID 24989346Methyl 3-amino-5-(3,3-dimethylbut-1-yn-1-yl)thiophene-2-carboxylate

Product 1

HCID 666035305-(3,3-dimethyl-but-1-ynyl)-3-(N-tert-butoxycarbonyl-piperidin-4-yl)amino-thiophene-2-carboxylic acid methyl esterYield 204.8%

Reagents, catalysts & solvents 3

HCID 12688Dibutyltin dichlorideCatalyst2×HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 5-(3,3-dimethyl-but-1-ynyl)-3-amino-thiophene-2-carboxylic acid methyl ester (1.512 g, 5.97 mmol) and N-tert-butoxycarbonyl-piperidin-4-one (1.189 g, 5.97 mmol) in 2 mL of dry THF is added dibutyltin dichloride (181 mg, 0.60 mmol), and the mixture is stirred for 10 min at room temperature under nitrogen. Then phenylsilane (810 μL, 6.57 mmol) is added, and the mixture is stirred for 24 h at room temperature. Additional 595 mg of N-tert-butoxycarbonyl-piperidin-4-one, 90 mg of dibutyltin dichloride and 405 μL of phenylsilane are added, and the mixture is stirred for another 24 h. Then the mixture is diluted with CH2Cl2, washed with brine, organic fraction is separated, dried over Na2SO4, and concentrated to give 5.142 g of crude 5-(3,3-dimethyl-but-1-ynyl)-3-(N-tert-butoxycarbonyl-piperidin-4-yl)amino-thiophene-2-carboxylic acid methyl ester.

Workup

  1. stirringthe mixture is stirred for 24 h at room temperature
  2. stirringthe mixture is stirred for another 24 h
  3. washwashed with brine, organic fraction
  4. customis separated
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-50b6b9afc03e429fa47afaa17ddc7a8c
Source dataset
uspto-grants-2014_02
Patent number
US08658674B2

Reaction notes

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