Catalytic Asymmetric Synthesis of Antimalarial Alkaloids Febrifugine and Isofebrifugine and Their Biological Activity
作者:Shū Kobayashi、Masaharu Ueno、Ritsu Suzuki、Haruro Ishitani、Hye-Sook Kim、Yusuke Wataya
DOI:10.1021/jo990877k
日期:1999.9.1
These unambiguous total asymmetric syntheses revealed that the absolute configurations of febrifugine and isofebrifugine were not (2'S,3'R) and (2'R,3'R) as reported previously but (2'R,3'S) and (2'S,3'S), respectively (1' and 2'). Finally, antimalarial activities of the synthesized febrifugine and isofebrifugine, and their antipodes, were examined. It was revealed that the activities and selectivities
在催化不对称合成的基础上,由简单的非手性原料有效地合成了抗疟药生物碱非来福因(1)和异氟苯丙氨酸(2)。使用锡(II)介导的催化不对称醛醇缩合规程进行了第一个关键反应,以高收率和高非对映选择性和对映选择性提供手性醛3。第二个关键步骤,曼尼希型反应,根据常规方法未得到令人满意的结果。然后,我们使用路易斯酸表面活性剂组合催化剂(LASC)开发了醛,胺和乙烯基醚的新型曼尼希型三组分水溶液反应,并以高收率获得了关键中间体16和17。溴丙酮14与4-羟基喹唑啉的最终偶联反应是在碱性条件下进行的,连续脱保护得到1和2,没有任何异构化。这些明确的总不对称合成表明,如先前所报道的那样,非溴夫定和异氟哌啶的绝对构型不是(2'S,3'R)和(2'R,3'R),而是(2'R,3'S)和(2'S,3'S) ,分别为(1'和2')。最后,检查了合成的非溴夫定和异氟苯丙氨酸及其对映体的抗疟活性。结果表明,天然非贝非明