New regiocontrolled syntheses of pyrrolopyrazinones and its application to the synthesis of peramine
作者:Yuta Yamamoto、Atsuo Nakazaki、Toshio Nishikawa
DOI:10.1016/j.tet.2017.05.004
日期:2017.6
Two novel regiocontrolled syntheses of pyrrolopyrazinones were developed. N-Methylpyrrole amide and 1-bromo-1-alkyne were annulated in the presence of a copper catalyst to give 3-substituted pyrrolopyrazinone in a regioselective manner. In contrast, heating N-methylpyrrole amide with the same haloalkyne in the presence of K3PO4 provided the haloaminal, which was transformed regioselectively into 4-substituted
开发了两种新颖的吡咯并吡嗪酮的区域控制合成。Ñ -Methylpyrrole酰胺和1-溴-1-炔在铜催化剂的存在下环化,得到3-取代的pyrrolopyrazinone以区域选择性的方式。相反,在K 3 PO 4存在下,将N-甲基吡咯酰胺与相同的卤代炔一起加热提供了卤代氨基缩醛,其被区域选择性地转化为4-取代的吡咯并吡嗪酮。前一种方法已成功地应用于过胺的合成,过胺是一种从内生真菌中分离出来的天然产物。