Determining a Synthetic Approach to Pierisformaside C
摘要:
An efficient route detailing the construction of the central core of pierisformaside C, the first grayanane-type diterpene to possess three central double bonds, is reported.
The synthesis of fused and bridged ring systems by free radical carbocyclization. A general route to masked 1,4-diketones.
作者:N.N. Marinovic、H. Ramanathan
DOI:10.1016/s0040-4039(00)81793-1
日期:1983.1
A new method for the synthesis of fused and bridged ringsystems based on intramolecular addition of a vinyl radical to α,β-unsaturated carbonyls is described. The method represents a general route to masked γ-diketones.
Radical cyclization of vinyl and aryl halides was performed by indirect electroreduction using a nickel(II) complex as a catalyst.
乙烯基和芳基卤化物的自由基环化反应是通过使用镍(II)络合物作为催化剂进行间接电还原而实现的。
6‐Methylenebicyclo[3.2.1]oct‐1‐en‐3‐one: A Twisted Olefin as Diels–Alder Dienophile for Expedited Syntheses of Four Kaurane Diterpenoids
作者:Junjie Wang、Dawei Ma
DOI:10.1002/anie.201909349
日期:2019.10.28
of its bromide precursor. Its reactions as a dienophile with several dienes in Diels-Alder reactions proceeded smoothly to provide tricyclic and tetracyclic adducts, which allowed short syntheses (10-11 steps) of four kurane diterpenoids including 11β-hydroxy-16-kaurene, 11α-hydroxy-16-kaurene, liangshanin G, and gesneroidin B.
Pd‐Catalyzed Regio‐ and Diastereoselective Heck Cyclization to Access Bicyclo[3.2.1]octanone Ring Systems
作者:Bo Li、Guiming Zhang、Tao Xu
DOI:10.1002/cctc.202001089
日期:2020.10.20
Pd‐catalyzed regioselective reductive‐Heck cyclization was developed to access variously substituted bicyclo[3.2.1]octan‐2‐ones, with isolated yields up to 94 %, starting from commercially available anisole derivatives. The reactions displayed complementary merits to classical radical‐mediated pathway in both avoiding stoichiometric tin reagent and good compatibility towards alkyne/alkene bearing substrates