A series of novel 3,4,5,6-tetrahydropyrimidinium salts, the precursor of N-heterocyclic carbene, were synthesized in high yields using a two-step procedure starting from commercially available amino alcohols. In situ prepared corresponding carbenes were tested in palladium-catalyzed C(sp³)−H arylation of 4-benzylpyridine with aryl bromides, affording triarylmethane derivatives in high yields.

中文翻译：

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带有两个羟基的新型C ₂对称六元卡宾配体，用于钯催化的二芳基甲烷中sp ³ C–H键的去质子交叉偶联过程（DCCP）

N-杂环卡宾的前体，一系列新的3,4,5,6-四氢嘧啶鎓盐，是从商业上可获得的氨基醇开始，采用两步法高收率合成的。在4-苄基吡啶与芳基溴化物的钯催化的C（sp ³）-H芳基化反应中测试了原位制备的相应碳烯，以高收率得到了三芳基甲烷衍生物。