Palladium-Acid Co-Catalyzed Cleavage of Alkynoates to Construct Dibenzo[c,h]xanthene Derivatives
作者:Bo-Cheng Tang、Miao Wang、Jin-Tian Ma、Zi-Xuan Wang、Yan-Dong Wu、An-Xin Wu
DOI:10.1002/adsc.201800770
日期:2018.10.18
A novel palladium‐acid co‐catalyzed C(sp)−C(sp2) cleavage of alkynoates for the construction of dibenzo[c,h]xanthene derivatives is reported. A catalytic amount of triflic acid (TfOH) afforded an efficient transformation into the final product. Furthermore, a reduction process of alkynoates was observed during the formation of dibenzo[c,h]xanthene, preliminary mechanistic studies indicated that the
报道了一种新颖的钯酸共催化炔烃的C(sp)-C(sp 2)裂解,用于构建二苯并[c,h]氧杂蒽衍生物。催化量的三氟甲磺酸(TfOH)有效转化为最终产物。此外,在二苯并[c,h] x吨的形成过程中观察到了炔酸的还原过程,初步的机理研究表明,二苯并[c,h] x吨的新形成的甲基质子化主要来自水。