Sodium Hydroxide → (5-Methylthiophen-2-yl)methanamine

HRID 1365746Notes

Reaction equation

HRID 1365746 reaction equation
[H-].[Al+3].[Li+].[H-].[H-].[H-].[Br:7][C:8]1[CH:12]=[C:11]([CH3:13])[S:10][C:9]=1[CH:14]=[N:15]O.[OH-].[Na+].[O-]S([O-])(=O)=O.[Na+].[Na+]>C(OCC)C.O>[Br:7][C:8]1[CH:12]=[C:11]([CH3:13])[S:10][C:9]=1[CH2:14][NH2:15].[CH3:13][C:11]1[S:10][C:9]([CH2:14][NH2:15])=[CH:8][CH:12]=1

Participants

8

Reactant 4

HCID 14798Sodium HydroxideHCID 24436Sodium SulfateHCID 21226445Aluminium lithium hydrideHCID 72346775HCID 72346775, compound

Product 2

HCID 4313442(5-Methylthiophen-2-yl)methanamineYield 30%HCID 59646782HCID 59646782, compound

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 3283Diethyl EtherSolvent3×

Procedure

To a stirred solution of lithium aluminum hydride in Et2O (1M, 4.1 mL, 4.1 mmol; Aldrich) and diethyl ether (15 mL, Sure Seal, Aldrich) was added drop-wise over 10 min a solution of the 3-bromo-5-methylthiophene-2-carbaldehyde oxime (450 mg, 2.05 mmol) in Et2O (20 mL; Sure Seal, Aldrich) at room temperature and then the mixture stirred at room temperature for 4 h under a nitrogen atmosphere. To the mixture was added drop-wise and carefully with vigorous stirring water (1 mL), 15% NaOH (1 mL) and then water (3 mL). After stirring for 1 h, to this was added Na2SO4 (10 g) and stirred for another 1 h. This was filtered through Celite and washed with CH2Cl2. The filtrate and washings were combined, concentrated in vacuo to obtain 275 mg (1.33 mmol, Y. 65%) of the title compound contaminated about 30% of (5-methylthiophen-2-yl)methanamine as a brownish oil: HPLC: 1.04 min (AP 60% at 254 nm); impurity peaks at 0.55 min (AP 20% for des-Br-amine), 1.63 min (AP 11%, unknown); LC/MS m/z 189/191 (M+H—NH3); 1H NMR (500 MHz, CDCl3) δ ppm 2.43 (3H, s, CH3), 3.90 (2H, s, CH2), 6.59 (1H, s, Th—H).

Workup

  1. additionTo the mixture was added drop-wise
  2. stirringAfter stirring for 1 h
  3. stirringstirred for another 1 h
  4. filtrationThis was filtered through Celite
  5. washwashed with CH2Cl2
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-7dd18b5c62bf4932addb5dc5437f3a8b
Source dataset
uspto-grants-2011_02
Patent number
US07893055B2

Reaction notes

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