First total synthesis of two new heterocyclic compounds: Bretschneiderazines A and B
作者:Qing Chao Liu、Tian Tian Guo、Zheng Fan、Dong Li、Wen Hong Li
DOI:10.1016/j.cclet.2010.11.036
日期:2011.7
heterocyclic compounds bretschneiderazines A ( 2 ) and B ( 3 ), isolated from an extract of the stems of Bretschneidera sinensis , is reported. We employed the cyclization reaction of benzamide by directed lithiation and sequential treatment with sulfur and phosgene as key steps. All new compounds have been fully characterized by means of IR, 1 H NMR, 13 C NMR, and HRMS.
摘要报道了两种新的天然杂环化合物bretschneiderazines A(2)和B(3)的简便合成方法,该化合物是从中华小Bre(Bretschneidera sinensis)茎提取物中分离得到的。我们通过直接锂化和以硫和光气作为关键步骤的顺序处理,采用了苯甲酰胺的环化反应。所有新化合物均已通过IR,1 H NMR,13 C NMR和HRMS进行了全面表征。