3-Thiophenethiol → (-)-3-((2-Amino-2-ethylhexyl)thio)thiophene

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Reaction Steps

To a solution of n-butyl lithium in hexane (194 ml 1.6M) under nitrogen at -78° C. was added diethyl ether(120 ml) and then dropwise 3-bromothiophene (28 ml). The reaction was warmed to -30° C. and then cooled to -50° C. and powdered sulfur (10 g) was added. The reaction was stirred 15 hours at room temperature and then a solution of potassium hydroxide (24 g) in 160 ml water was added and the ether layer was discarded. The aqueous layer was treated at -5° C. with 6N hydrochloric acid (125 ml) and extracted with dichloromethane and the extract was dried over magnesium sulfate. Filtration and solvent removal afforded crude 3-thiophenthiol (14.1 g). The crude 3-thiophenthiol (10 g) was combined with 2-butyl-2-ethylaziridine (12.6 g, Synthetic Example 1(f)) at 0° C. and the reaction was stirred 15 hours at room temperature. The crude reaction product was purified by column chromatography on silica using 5% methanol in diethyl ether as eluant to give the desired product as an oil (16.4 g). 1H NMR is consistent with proposed structure.

Provenance & Evidence