3-Methoxypropylamine → 3-Methoxypropyl isothiocyanate
Reaction equation
[CH3:1][O:2][CH2:3][CH2:4][CH2:5][NH2:6].[C:7](Cl)(Cl)=[S:8].[NH2:11][NH2:12]>N1C=CC=CC=1>[CH3:1][O:2][CH2:3][CH2:4][CH2:5][N:6]=[C:7]=[S:8].[CH3:1][O:2][CH2:3][CH2:4][CH2:5][NH:6][C:7](=[S:8])[NH:11][NH2:12]Participants
Reactant 3
Product 2
Reagents, catalysts & solvents 1
Procedure
The title compound was synthesized in a manner similar to that described in Example 1. 3-Methoxy-n-propyl isothiocyanate was prepared from 3-methoxy-n-propylamine and thiophosgene at high temperature and then reacted with hydrazine in pyridine to give the intermediate 4-(3-methoxy-n-propyl)-3-thiosemicarbazide. 4-(3-Methoxy-n-propyl)-3-thiosemicarbazide (1.64 g) was reacted with 1-ethyl-3-methylpyrazole-5-carboxylic acid chloride (1.73 g, prepared from the acid and oxalyl chloride) to give 2 g of 1-(1-ethyl-3-methylpyrazole-5-carbonyl)-4-(3-methoxy-n-propyl)-3-thiosemicarbazide. Treatment of 1-(1-ethyl-3-methylpyrazole-5-carbonyl)-4-(3-methoxy-n-propyl)-3-thiosemicarbazide with potassium hydroxide in ethanol gave 3-(1-ethyl-3-methylpyrazol-5-yl)-5-mercapto-4-(3-methoxy-n-propyl)-1,2,4-triazole. Reaction of the sodium salt of 3-(1-ethyl-3-methylpyrazol-5-yl)-5-mercapto-4-(3-methoxy-n-propyl)-1,2,4-triazole(0.73 g) with 2-bromo-5-nitrothiazole (0.52 g) yielded crude 3-(1-ethyl-3-methylpyrazol-5-yl)-4-(3-methoxy-n-propyl)-5-[5-(nitrothiazol-2-yl)mercapto]-1,2,4-triazole as in Example 1. Crystallization from ethanol and water gave 0.3 g of 3-(1-ethyl-3-methylpyrazol-5-yl)-4-(3-methoxy-n-propyl)-5-[5-(nitrothiazol-2-yl)mercapto]-1,2,4-triazole, a light brown solid, MP 117-118° C.
Sources & evidence
- ORD record
- ord-ec86f192fa2d469b9b09fd20da17e9f6
- Source dataset
- uspto-grants-2000_06
- Patent number
- US06080772
Reaction notes
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