Verongidolide是一种天然大环内酯,最近从新喀里多尼亚海绵Verongidolae中分离出来。这种天然产物的结构类似于超滑石的结构,也从新喀里多尼亚海绵Neosiphonia superstes中分离出来。从生物学的角度来看,Verongidolide和超杀菌素A和B对人口腔癌KB(0.3 nM)具有有效的细胞毒性。通过比较1 H NMR化学位移和偶联常数,我们得出结论:Verongidolide具有顺式-Decalin核心,并且我们假设顺式的相对构型-decalin核心与超级杀菌剂A相似。为验证这一假设,尝试了分子内和环每年的Diels-Alder反应来构建decalin核心。出乎意料的是,Diels-Alder反应的选择性是exo,并且对关键反应机理进行了深入的DFT计算,以了解控制这一意料之外的选择性的因素。
Improved Total Synthesis of the Potent HDAC Inhibitor FK228 (FR-901228)
作者:Thomas J. Greshock、Deidre M. Johns、Yasuo Noguchi、Robert M. Williams
DOI:10.1021/ol702957z
日期:2008.2.1
A scaleable synthesis of the potent histone deacetylase (HDAC) inhibitor FK228 is described. A reliable strategy for preparing the key,beta-hydroxy mercapto heptenoic acid partner was accomplished in nine steps and 13% overall yield. A Noyori asymmetric hydrogen-transfer reaction established the hydroxyl stereochemistry in >99:1 er via the reduction of a propargylic ketone.
Intramolecular Diels–Alder Approaches to the Decalin Core of Verongidolide: The Origin of the <i>exo</i>-Selectivity, a DFT Analysis
Verongidolide is a natural macrolactone recently isolated from a New Caledonia sponge, Verongidolae. The structure of this naturalproduct is similar to the structure of superstolides, also isolated from a New Caledonian sponge, Neosiphonia superstes. From a biological point of view, verongidolide and superstolides A and B present potent cytotoxicity against human oral carcinoma KB (0.3 nM). By comparing
Verongidolide是一种天然大环内酯,最近从新喀里多尼亚海绵Verongidolae中分离出来。这种天然产物的结构类似于超滑石的结构,也从新喀里多尼亚海绵Neosiphonia superstes中分离出来。从生物学的角度来看,Verongidolide和超杀菌素A和B对人口腔癌KB(0.3 nM)具有有效的细胞毒性。通过比较1 H NMR化学位移和偶联常数,我们得出结论:Verongidolide具有顺式-Decalin核心,并且我们假设顺式的相对构型-decalin核心与超级杀菌剂A相似。为验证这一假设,尝试了分子内和环每年的Diels-Alder反应来构建decalin核心。出乎意料的是,Diels-Alder反应的选择性是exo,并且对关键反应机理进行了深入的DFT计算,以了解控制这一意料之外的选择性的因素。