The system Pd(OAc) 2 /dppb was found to be an efficient catalyst precursor for the direct arylation of 3-formylthiophene derivatives. When using 3-formylthiophene, the 2-arylated thiophenes were obtained with regioselectivities of 76―86 %, whereas the arylation of 3-formylthiophene diethyl acetal gave the 5-arylated thiophenes with regioselectivities of 64― 88 %. These reactions were performed by using
发现系统 Pd(OAc) 2 /dppb 是用于 3-甲酰基
噻吩衍
生物直接芳基化的有效催化剂前体。当使用 3-甲酰基
噻吩时,2-芳基
噻吩的区域选择性为 76-86%,而 3-甲酰基
噻吩二
乙缩醛的芳基化得到 5-芳基
噻吩,区域选择性为 64-88%。这些反应仅使用 0.1 mol% 的催化剂进行。此外,已发现该方法可耐受芳基
溴化物上的各种官能团,例如甲酰基、丙酰基、苯甲酰基、腈或硝基。