Synthesis of the Entomopathogenic Fungus Metabolites Militarinone C and Fumosorinone A
作者:Sebastian Bruckner、Marie Weise、Rainer Schobert
DOI:10.1021/acs.joc.8b01530
日期:2018.9.21
Militarinone C and fumosorinone A, 3-oligoenoyltetramic acids produced by insect pathogenic fungi, were synthesized for the first time. The pyrrolidine-2,4-dione ring was closed through a late-stage Dieckmann condensation of N-(β-ketoacyl) derivatives of tyrosine, obtained by its acylation with either thioesters or Meldrum’s acidderivativesbearing the all-trans-polyene side chain. The latter was built
A Unified Approach for the Stereoselective Total Synthesis of Pyridone Alkaloids and Their Neuritogenic Activity
作者:Henning Jacob Jessen、Andreas Schumacher、Travis Shaw、Andreas Pfaltz、Karl Gademann
DOI:10.1002/anie.201007671
日期:2011.4.26
neurite outgrowth might constitute a valuable approach for the non‐invasive medical treatment of neurodegenerative diseases. With the aid of a bifunctional building block, the total syntheses of a group of pyridone polyenes originally produced by entomopathogenic fungi was achieved (see picture). All of these natural products displayed neuritogenicactivity in the PC‐12 cell line.
Directed Orthometalation and the Asymmetric Total Synthesis of <i>N</i>-Deoxymilitarinone A and Torrubiellone B
作者:Feiqing Ding、Ronny William、Min Li Leow、Hua Chai、Jacqueline Zi Mei Fong、Xue-Wei Liu
DOI:10.1021/ol402820d
日期:2014.1.3
A diverted total synthesis (DTS) approach to the total synthesis of pyridone alkaloids N-deoxymilitarinone A (8) and torrubiellone B (10) has been developed. The common intermediate 14 was first assembled by a dual directed orthometalation process using a methoxymethyl group as directed metalation group. Other crucial steps include the assembly of polyenes under aldol condensation for DTS using general and concise strategy and diastereoselective synthesis of the syn-dimethyl array by an Evans aldol reaction.