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(a) One-pot synthesis of 2-benzylthiazolo[3,2-a]benzimidazoles 6 through a base-catalyzed cascade reaction of internal N-propargylamines 4 and CS2. (b) Synthesis of 2-methylene-thiazolo[2,3-b]quinazolinones 8 using 2-amino-propargylbenzamides 7 as substrates.
