Topologically Unique Scaffolds in Photoassisted Diversity Oriented Synthesis (PDO

描述（由申请人提供）：本提案的总体目标是开发一种新的合成方法，将高产光化学关键反应纳入多样性导向的分裂池组合合成。光化学提供了一系列壮观的骨架转化，但它们在高通量合成方法中的应用微不足道。我们的目标是开发一种新的合成方法，用于快速获取由各种官能团和碳/杂环悬垂装饰的拓扑多样的多环支架，由该核心框架刚性或半刚性地保持在独特的空间配置中。通过关键的光化学步骤及其与基态反应的结合，可以快速获得这种拓扑多样的支架，最突出的是最近发现的基于光解氧甲基化的合成序列。在官能团和/或杂环部分的分类中实现明确的三维关系是合成药物化学的核心。一个广泛的目标是通过系统地采样具有多样化核心结构和一系列外围功能的化学空间来产生潜在的药效团。从高通量化学的角度来看，这项任务只能通过一系列独特的核心支架来实现，这些核心支架以独特的3D模式悬挂各种功能吊坠。我们的光原分解法允许生成拓扑上前所未有的多环缩醛支架，在明确的空间排列中刚性地显示各种杂环。对于这种合成策略的分裂和池实施至关重要的是，光原性序列提供了接近定量的产量。

DESCRIPTION (provided by applicant): The general goal of this proposal is to develop a new synthetic methodology where high yielding photochemical key reactions are incorporated into a diversity-oriented split-and-pool combinatorial synthesis. Photochemistry offers a range of spectacular skeletal transformations, yet their utilization in high throughput synthetic methods is insignificant. We aim to develop a new synthetic methodology for rapid access to topologically diverse polycyclic scaffolds decorated by various functional groups and carbo/heterocyclic pendants, rigidly or semi-rigidly held in a unique spatial configuration by this core framework. Expeditious access to such topologically diverse scaffolds will be realized via key photochemical steps and their combination with ground state reactions, most prominently - the recently discovered synthetic sequence based on photoprotolytic oxametathesis. Achieving a well-defined three-dimensional relationship within an assortment of functional groups and/or heterocyclic moieties is central to synthetic medicinal chemistry. A broad objective is to generate potential pharmacophores by systematically sampling the chemical space with diversified core structures augmented with a range of peripheral functionalities. From the high throughput chemistry standpoint this task can only be achieved with a diverse set of distinctive core scaffolds suspending a variety of functional pendants in a unique 3D pattern. Our photoprotolytic oxametathesis allows for the generation of topologically unprecedented polycyclic acetal scaffolds, rigidly displaying a variety of heterocycles in a well-defined spatial arrangement. Critical for the split-and-pool implementation of this synthetic strategy is the fact that the photoprotolytic sequence offers nearly quantitative yields. PUBLIC HEALTH RELEVANCE: Photochemical reactions initiated by light hold unparalleled promise for building unusual molecular frameworks and offer expeditious access to difficult synthetic targets. Yet, with the exception of a few landmark syntheses, synthetic organic photochemistry remains underutilized by synthetic organic chemists. This is especially true for diversity-oriented synthesis (DOS) and its split-and-pool implementation, which are most relevant to high-throughput synthesis of small molecules and discovery of new promising therapeutic agents. We are developing novel synthetic methodologies, enabling us to gain expeditious access to a massive number of new drug-like molecules, which will be available for biological screening. Not unimportant is the fact that photochemical steps use light as a reagent, and therefore could be environmentally friendly.