Survey of Synthetic Approaches to Natural (Peyssonenynes) and Unnatural Acetoxyenediynes
作者:Patricia García-Domínguez、Rosana Alvarez、Ángel R. de Lera
DOI:10.1002/ejoc.201200246
日期:2012.9
Four convergent syntheticapproaches to acetoxyenediynes have been explored to gain access to peyssonenynes A and B, which are natural products isolated from the red alga Peyssonelia caulifera. After optimization of the routes with a palmitic acid based model system, the synthesis of the peyssonenynes was completed by using, as the key steps, 1) Ni/Cu co-catalyzed cross-coupling of terminal alkynes
Total synthesis of the proposed structures of the DNA methyl transferase inhibitors peyssonenynes, and structural revision of peyssonenyne B
作者:Patricia García-Domínguez、Ilaria Lepore、Cathie Erb、Hinrich Gronemeyer、Lucia Altucci、Rosana Álvarez、Ángel R. de Lera
DOI:10.1039/c1ob05932g
日期:——
Comparison of the NMR data of the synthetic and natural products revealed that only those of the Z isomers matched, which correspond to peyssonenyne A. Using HPLC analysis it was found that peyssonenyne B must correspond to the sn-2 positional isomer of the Z sn-1/3 counterpart. The four synthetic sn-1/3 diastereomers are roughly equipotent as DNMT1 inhibitors when evaluated on a radioactive methyl transfer
合成的假单胞菌A和B的据称结构,被认为是在乙酰氧二炔部分的几何异构体,并被认为是分离的。通过使用梯度HSQC脉冲序列的EXSIDE带变量测量的3 J H9–C7值的大小以及C 6的化学位移,可以确保合成化合物的E和Z几何形状。合成产物和天然产物的NMR数据比较表明,只有Z异构体的那些匹配,这对应于佩森烯炔A。使用HPLC分析发现,培生烯B必须与Z sn -1/3对应物的sn -2位置异构体相对应。当用抗DNMT1抗体从K562人白血病细胞免疫沉淀后,在放射性甲基转移酶法上进行评估时,四种合成的sn -1/3非对映异构体与DNMT1抑制剂大致相当。