γ-Lactam derivatives are widespread biologically active compounds, covering a large range of activities. Following our interest in both medicinal and green chemistries, we developed an original, cesium salts-mediated, scalable and solvent-free methodology to transform biosourced pyroglutamic acid and itsderivatives to their N,N′-aminals, N,O,N,S-acetals and C5-substituted γ-lactams in good to excellent
As new environmentally friendly and effective antifungal agents are deeply needed, efficient ecofriendly strategies were designed to access two series of compounds inspired from natural γ-lactams. Designed compounds were fully characterized and evaluated as antifungal candidates against Zymoseptoria tritici, the main pathogen on wheat crops. The targeted derivatives were prepared from natural resources
由于迫切需要新的环保和有效的抗真菌剂,因此设计了有效的环保策略来获得受天然 γ-内酰胺启发的两个系列化合物。设计的化合物经过充分表征和评估,可作为小麦作物的主要病原体小麦酵母菌的抗真菌候选物。目标衍生物是使用绿色溶剂、简单的程序和有限的纯化步骤从自然资源中制备的。这些受生物启发的化合物显示为进一步开发高效作物保护产品的良好候选者。事实上,HIT 化合物表现出 IC 50大约 1 μg/mL 并且比参考戊唑醇和联苯胺对一些多重耐药菌株更有效。每个系列都获得了两打衍生物,可以建立早期的构效关系,用于开发具有更高功效的下一代 γ-内酰胺衍生物。
Total Syntheses of (±)- and (−)-Stemoamide
作者:Peter A. Jacobi、Kyungae Lee
DOI:10.1021/ja994214w
日期:2000.5.1
(±)-Stemoamide (1) was prepared in seven steps beginning with γ-chlorobutryl chloride (20) and succinimide (15), which were efficiently converted to the key alkyne oxazole 17 on a multigram scale. Intramolecular (Diels−Alder)−(retro-Diels−Alder) reaction of 17 then gave butenolide 12b directly upon aqueous workup. The remaining two stereocenters in 1 were established in a single step by a highly selective
Rhodium-catalyzed silylformylation and amidocarbonylation are applied to the syntheses of pyrrolizidinealkaloids, (±)-isoretronecanol and (±)-trachelanthamidine, from 5-ethynyl-2-pyrrolidinone.