Tetrafluoroborate → 1-(1-Benzyl-2-pyrrolidylidene)-3-(4-methylthiophenyl)urea

Participants

Reaction Steps

The fluoroborate salt of 1-benzyl-2-iminopyrrolidine (6.55 g; 0.025 mole) is converted to the free base (4.36 g.; 0.025 mole) in the usual manner. After drying over K2CO3, the benzene solution is filtered through diatomaceous earth and 4.13 g. (0.025 mole) of 4-methylthiophenylisocyanate is added. The reaction mixture is stirred at room temperature for 1 hour and then evaporated to dryness in vacuo to give an oil which crystallizes. Recrystallizations from acetone-ether yields the pure product, 1-(1-benzyl-2-pyrrolidylidene)-3-(4-methylthiophenyl)urea, m.p. = 113°-115° C.

Provenance & Evidence