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 Concise and Efficient Total Synthesis of Militarinone D
作者:Uttam Dash、Sandip Sengupta、Taebo Sim
DOI:10.1002/ejoc.201500380
日期:2015.6
A highly stereoselective, concise (14 steps longest linear sequence and 20 steps overall), and efficient (15 % overall yield) synthesis of militarinone D has been accomplished. The key reactions utilized in the sequence are enzymatic desymmetrization, cis/trans isomerization, Horner–Wadsworth–Emmons olefination, and addition of an organolithium species to a highly conjugated chiral aldehyde. The simplicity
高度立体选择性、简洁(14 步最长的线性序列和 20 步总步)和高效(15% 总产率)的米利他酮 D 合成已经完成。该序列中使用的关键反应是酶促去对称化、顺式/反式异构化、Horner-Wadsworth-Emmons 烯化以及将有机锂物质添加到高度共轭的手性醛中。该策略的简单性使其可用于该目标的大规模生产。此外,用于设计路线的策略应适用于具有各种取代吡啶酮核心结构的类似物的制备。
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.
Collective Synthesis of 4-Hydroxy-2-pyridone Alkaloids and Their Antiproliferation Activities
作者:Feiqing Ding、Min Li Leow、Jimei Ma、Ronny William、Hongze Liao、Xue-Wei Liu
DOI:10.1002/asia.201402466
日期:2014.9
A collectivesynthesis of 4‐hydroxy‐2‐pyridone alkaloids—specifically, pretenellin B, prebassianin B, farinosone A, militarione D, pyridovericin, and torrubiellone C—has been achieved. Key steps include using a strategic convergent method to synthesize the densely substituted pyridone key intermediate by Suzuki–Miyaura cross‐coupling reaction, a divergent synthesis approach of target molecules by aldol
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.