In a one‐step conversion, commercially available or known compounds are connected to form myrtucommulone A, an anti‐inflammatory and apoptosis‐inducing substance from the common myrtle Myrtus communis (see scheme). This strategy can be used, as well to prepare myrtucommulone libraries.
Myrtucommulone A (1), which was isolated from myrtle and other species of the myrtaceae family, was synthesized through an enantioselective Michael addition of isobutyryl phloroglucinol (5) to isobutylidene syncarpic acid (4) that was induced by a chiral Al–Li–BINOL (1,1′-bi-2-naphthol) complex [(S,S)-ALB]. Because there is significant steric crowding in Michael acceptor 4, myrtucommulone A (1) was
从桃金娘和桃金娘科其他物种中分离出来的桃金娘 A (1) 是通过异丁酰间苯三酚 (5) 与异丁叉合果酸 (4) 的对映选择性迈克尔加成合成的,该加成是由手性 Al-Li-BINOL 诱导的(1,1'-bi-2-naphthol) 复合物 [(S,S)-ALB]。由于迈克尔受体 4 中存在显着的空间拥挤,因此获得了 ee 值为 70% 的桃金娘酮 A (1) 以及化学产率为 77% 的 meso-1。
Metal catalysed versus organocatalysed stereoselective synthesis: The concrete case of myrtucommulones
作者:Maël Charpentier、Johann Jauch
DOI:10.1016/j.tet.2017.10.011
日期:2017.11
natural compounds which offer various alternatives to the treatment of pain, inflammation and cancer. Their stereoselectivesynthesis remains therefore a key-challenge towards its use in the pharmaceutical industry. In the present work myrtucommulone A and B were synthesised through metal catalysis with 81 and 72% ee respectively. Thanks to the use of cinchonidine as an organocatalyst, 82 and 84% de were
Myrtucommulone A (MC A) (1), isolated from Myrtus communis (myrtle), shows the same pharmacological activity for inhibition of inflammation and induction of apoptosis as synthetic MC A, which consists of three stereoisomers, i.e., two enantiomers and one meso form. This led to the question of whether the natural MC A is a pure stereoisomer or a mixture of stereoisomers. The specific rotation and electronic
[DE] SYNTHESE VON MYRTUCOMMULON A UND MYRTUCOMMULON-ANALOGA<br/>[EN] SYNTHESIS OF MYRTUCOMMULON A AND MYRTUCOMMULON ANALOGUES<br/>[FR] SYNTHÈSE DE MYRTUCOMMULONE A ET D'ANALOGUES À LA MYRTUCOMMULONE
申请人:UNIV SAARLAND
公开号:WO2010022953A2
公开(公告)日:2010-03-04
Es wird eine 6-stufige (Variante 1) bzw. 5-stufige (Variante 2) Synthese von Myrtucommulon A und Derivaten desselben sowie eine Synthese von Syncarpinsäure und Derivaten derselben beschrieben.