Pyrimidines by a Consecutive 3CR of Acid Chlorides, Alkynes, and Amidinium Salts

2 Pyrimidines by a Consecutive 3CR of Acid Chlorides, Alkynes, and Amidinium Salts 

4 Pyrimidines by a Two-Step Sequence of Consecutive SCR of (Hetero)Arenes, Oxalyl Chloride, Alkynes, and Cyclocondensation with Guanidinium Salts 

Based on mechanistic reasoning, the use of carbon monoxide or molybdenum hexacarbonyl as suitable CO sources necessitates of application of aryl halides. In addition, the effective concentration of CO in the reaction medium plays a crucial 

1%PdCl2(PPh3)2, 1%Cul, alkyne 4 (1.0 equiv) NEt3 (2.0 equiv) 

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