Triethylamine → 1-(6-Chloro-2-methyl-phenyl)-3-ethyl-3,4,5,6-tetrahydro-pyrimidine-2(1h)-thione

Beteiligte Stoffe

Reaktionsschritte

To an ice-cold solution of the diamine of Step A (3.4 g) and triethylamine (4.0 mL) in dry chloroform (50 mL) was added thiophosgene (1.7 mL). After 20 minutes at ambient temperature, the reaction was quenched with water and extracted with dichloromethane. The extracts were combined, dried over sodium sulfate and concentrated in vacuo to give a brown oil. The crude material was dissolved in dichloromethane and absorbed onto a column of Merck-60 flash silica gel. Elution with 11% ethyl acetate in hexane provided an orange solid which was triturated with diethyl ether to give the title product (2.4 g, 59.5%) as a white solid, m.p. 88-90° C.

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