Total Synthesis of <scp>UCS1025A</scp> via Tandem Carbonylative Stille Cross Coupling and <scp>Diels‐Alder</scp> Reaction<sup>†</sup>
作者:Chengsen Cui、Mingji Dai
DOI:10.1002/cjoc.202300331
日期:2023.11.15
pyrrolizidinone polyketides, from which members with potent antibacterial, antifungal, and anticancer activities have been identified. Our approach features a tandem carbonylative Stille cross coupling and Diels-Alder reaction to forge a key C—C bond and build the trans-decalin system. This tandem process utilizes carbon monoxide as a one-carbon linchpin to stitch a vinyl triflate and a vinylstannane
The asymmetric total synthesis of UCS1025A is accomplished by establishing a novel and efficient method for the construction of a tricyclic pyrrolizidinone skeleton based on a sequential Michael-retro Michael strategy. The key step is a one-pot six-step cascade reaction including oxidation of a primary alcohol to the corresponding carboxylic acid, a retro thio-Michael reaction, and an intramolecular