[EN] METHODS OF MAKING MULTICYCLIC COMPOUNDS USING MULTICOMPONENT/TANDEM REACTION SEQUENCES<br/>[FR] PROCÉDÉS DE FABRICATION DE COMPOSÉS POLYCYCLIQUES À L'AIDE DE SÉQUENCES DE RÉACTION EN TANDEM/À PLUSIEURS COMPOSANTS
申请人:UNIV NEVADA RENO
公开号:WO2016153906A1
公开(公告)日:2016-09-29
Disclosed herein are embodiments of multicyclic compounds and methods of making such compounds. The disclosed methods reduce step-counts in the synthesis of complex targets, while reducing costs and waste streams.
作者:Colin F. Lynch、Joseph W. Downey、Yongliang Zhang、Jacob M. Hooker、Mark D. Levin
DOI:10.1021/acs.orglett.3c02838
日期:2023.10.6
carbon of phenols. Our approach relies on the synthesis of a 1,5-dibromo-1,4-pentadiene precursor, which upon lithium–halogen exchange followed by treatment with carbonate esters results in a formal [5 + 1] cyclization to form the phenol product. Using this strategy, we have prepared 12 1-13C-labeled phenols, show proof-of-concept for the labeling of phenols with carbon-14, and demonstrate phenol synthesis
Synthesis of Simple Diynals, Diynones, Their Hydrazones, and Diazo Compounds: Precursors to a Family of Dialkynyl Carbenes (R<sup>1</sup>—C≡C—C̈—C≡C—R<sup>2</sup>)
作者:Nathan P. Bowling、Nicola J. Burrmann、Robert J. Halter、Jonathan A. Hodges、Robert J. McMahon
DOI:10.1021/jo101125y
日期:2010.10.1
A variety of substituted pentadiynols, -diynals, and -diynones have been prepared en route to precursors to dialkynyl carbenes (R-1-C C-C-C C-R-2). In light of the marginal stability associated with these simple systems, several strategies were required to assemble the carbon backbones. The requisite five-carbon skeletons were prepared using 4 + 1, 3 2, 2 + 2 + 1, and 2 + 1 + 1 + 1 coupling methodologies. The Dess Martin periodinane serves as an excellent method for the oxidation of pentadiynols to diynals and diynones, although many of the oxidized products are sufficiently reactive that they were not isolated; rather, they were generated in situ and intercepted with nucleophiles such as tosylhydrazide or trisylhydrazide. The hydrazone derivatives are generally reliable precursors to diazo compounds and carbenes, although cyclization of the hydrazone to afford a pyrazole can be a complicating factor in certain instances.