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Preparation of N,N‐dialkylthioureas as key intermediates of BTZ synthesis (Synthesis from benzoyl isothiocyanates (a), Synthesis under use of thiocarbonyldiimidazole (b) or trimethylsilyl isothiocyanate (c): (i) NaSCN, acetone; (ii) secondary amine, acetone (iii) 36 % HCl, 95 °C; (iv) secondary amine, THF; (v) isopropanol/water (9 : 1), reflux; (vi) secondary amine, THF; (vii) 2 N ammonia in MeOH, THF.
