Unprecedented single-pot protocol for the synthesis of N1, C6-linked bicyclic 3,4-dihydropyrimidinones via lithiation of Biginelli compounds
作者:Kamaljit Singh、Sukhdeep Singh
DOI:10.1016/j.tet.2008.10.001
日期:2008.12
4-Aryl/alkyl-6-methyl-3,4-dihydropyrimidin-2(1H)-one ester derivatives readily undergo metalation at the C6 methyl (vinylogous ester) position along with two acidic NHs upon treatment with n-butyllithium at −10 °C. The trianion of DHPMs thus obtained react smoothly with various terminal dibromoalkanes to afford N1, C6-linked bicyclic DHPM derivatives, which represent key structural features of the
4-芳基/烷基-6-甲基-3,4-二氢-2(1 H ^) -酮酯衍生物时容易治疗经历在C6甲基(插烯酯)的位置与金属化两个酸性NHS沿Ñ在丁基锂- 10°C。如此获得的DHPM的三阴离子可与各种末端二溴代烷烃平稳反应,以提供N1,C6连接的双环DHPM衍生物,这些衍生物代表了具有药效的海洋生物碱如batzelladine A和crambescin A的关键结构特征。