POCl<sub>3</sub>-mediated cyclization of (+)-S-mahanimbine led to the divergent synthesis of natural product derivatives with antiplasmodial activity
作者:Yedukondalu Nalli、Vandana Thakur、Asif Mohmmed、Vivek Kumar Gupta、Asif Ali
DOI:10.1039/c7nj00487g
日期:——
undergoes rearrangements under thermal, photolytic, or acidic conditions and is transformed into diverse structural motifs; most of its derivatives have also been reported as natural products with distinct biological activities. Herein, we report the POCl3-mediated reaction of (+)-S-mahanimbine, which rearranged and transformed into seven new and five known natural products viz. isocyclomahanimbine (3)
(+)-Mahanimbine(1)是从Murraya koenigii分离出的咔唑生物碱。它在热,光解或酸性条件下会发生重排,并转变成各种结构图案。据报道,其大多数衍生物是具有独特生物活性的天然产物。在此,我们报道了POCl 3介导的(+)- S-马尼宾滨反应,该反应重新排列并转化为七个新的和五个已知的天然产物,即。异环马哈宁(3),姜黄素(5),双环马哈宁(9),姜黄素(10)和莫拉唑啉(13)),其中包括以前未公开的化学信息。通过大量的1D和2D NMR实验,HRESIMS并与文献数据进行比较,对化合物的(1-13)结构进行了鉴定。通过X射线晶体衍射分析明确地确认了化合物3。化合物1-13筛选首次针对抗寄生虫活性恶性疟原虫,其中,所述新化合物2,6和7被证明是最有效的,并与IC显示出最高的抗疟原虫活性50分别为2.7、4.5和3.2μM。这些发现可能为新的吡喃咔唑生物碱衍生物的设计提供新的见识,具有抗疟原虫的潜力。