A highly geometry-selective organocatalytic acylation of tri- and tetra-substituted 2-alkylidene-1,3-propanediols has been developed. The highly E-selective acylation of various tetrasubstituted 2-alkylidene-1,3-propanediols was achieved in 96 to >99% selectivity for the first time by a non-enzymatic protocol.
Synthesis of the C1-C14 Fragment of Sarcoglaucol-16-one via Z-Selective Ando-Type Horner-Wadsworth-Emmons Olefination
作者:Sabine Laschat、Christoph Gastl
DOI:10.1055/s-0029-1218825
日期:2010.8
A synthetic strategy involving a Z-selective Horner-Wadsworth-Emmons olefination was developed for the preparation of the sarcoglaucolone precursor methyl (2Z,6E)-8-(methoxymethoxy)-6-methyl-2-[(3E)-4-methyl-5-oxopent-3-enyl]-9-[(trimethylsilyl)methyl]deca-2,6,9-trienoate. The target compound was isolated in a E/Z ratio of 17:83
Evolution of an oxidative dearomatization enabled total synthesis of vinigrol
作者:Qingliang Yang、Cristian Draghici、Jon T. Njardarson、Fang Li、Brandon R. Smith、Pradipta Das
DOI:10.1039/c3ob42191k
日期:——
synthetic strategy resulting in a totalsynthesis of vinigrol is presented. Oxidative dearomatization/intramolecular Diels–Alder cycloaddition has served as the successful cornerstone for all of the approaches. Extensive radical cyclization efforts to form the tetracyclic core resulted in interesting and surprising reaction outcomes, none of which could be advanced to vinigrol. These cyclization obstacles
作者:Qingliang Yang、Jon T. Njardarson、Cristian Draghici、Fang Li
DOI:10.1002/anie.201304624
日期:2013.8.12
total synthesis of vinigrol features a strategic oxidative dearomatization/Diels–Alder cycloaddition reaction and a subsequent palladium‐catalyzed cyclization cascade to construct the carbocyclic core. The C4, C9, and C12 stereocenters were installed using either reduction or oxidation reactions, and the diterpenoid core was unraveled by a ring fragmentation reaction.
Rapid Assembly of Vinigrol’s Unique Carbocyclic Skeleton
作者:Jason G. M. Morton、Cristian Draghici、Laura D. Kwon、Jon T. Njardarson
DOI:10.1021/ol901519k
日期:2009.10.15
Detailed in this account are our efforts toward the totalsynthesis of vinigrol. A highly expedient and convergent synthetic approach made possible by the use of a strategic oxidative dearomatization reaction coupled with a series of ensuing substrate controlled transformations is discussed.