作者:Takatsugu Murata、Teppei Kuboki、Ryo Ishikawa、Takahiro Saito、Shotaro Taguchi、Kazuma Takeuchi、Emiko Hatano、Motoyuki Shimonaka、Isamu Shiina
DOI:10.1021/acs.jnatprod.8b00215
日期:2018.11.26
The first total synthesis of violaceoid A, a cytotoxic agent, and the asymmetric total synthesis of (-)- and (+)-violaceoid B are reported. The precursor was accessed by desymmetrization of a substituted quinol moiety, and the racemic secondary alcohol was kinetically resolved using a chiral nucleophilic catalyst. The asymmetric synthesis of (-)- and (+)-violaceoid B elucidated the absolute configuration
据报道,第一个总的类紫罗兰素A是一种细胞毒剂,并且不对称地合成了(-)-和(+)-类紫罗兰素B。通过使取代的喹诺部分去对称化来获得前体,并且使用手性亲核催化剂将外消旋仲醇动力学拆分。(-)-和(+)-类紫胶B的不对称合成阐明了天然类紫胶B的绝对构型。合成的类紫胶A在低于100的浓度下抑制人乳腺癌细胞MCF-7和Hs 578T的生长。 μM,而(S)-和(R)-类紫胶B没有活性。