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| Building upon this work, we envisioned the construction of a larger library of alkaloid/terpenoid-like small molecules for further chemical and biological evaluation. Importantly, our original solution-phase synthesis was designed to facilitate future translation to solid-phase parallel synthesis through the incorporation of a tert-butyldiphenysilyl (TBDPS)-protected primary alcohol. This moiety serves as a faithful surrogate for a tertbutyldiarylsilyl (TBDAS) linker that we have previously developed (15). This robust linker is known to be stable to a variety of acidic and basic reaction conditions, and was expected to be similarly compatible with the desired transition metal-mediated cycloaddition and cyclization reactions, many of which had not previously been carried out on solid support. Moreover, we envisioned that the versatile tert-butylsulfinamide moiety could be used to introduce additional diversity through its inherent stereochemical diversity, hydrolysis to afford the corresponding secondary amines, and oxidation to provide related tert-butylsulfonamide congeners. |
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