Mild ArI-Catalyzed C(sp<sup>2</sup>)H or C(sp<sup>3</sup>)H Functionalization/CO Formation: An Intriguing Catalyst-Controlled Selectivity Switch
作者:Xueqiang Wang、Joan Gallardo-Donaire、Ruben Martin
DOI:10.1002/anie.201407011
日期:2014.10.6
A tandem C(sp2)H and C(sp3)Hfunctionalization/CO bond formation catalyzed by iodine(III) reagents generated in situ has been developed. The method shows wide scope under mild conditions and exhibits an unprecedented selectivity profile that can be switched depending on the catalyst employed.
C(SP A串联2) H和C(SP 3) ħ官能/ C 由碘催化O键形成原位产生(III)的试剂已经被开发出来。该方法在温和条件下显示范围广,并且显示出前所未有的选择性曲线,可以根据所用催化剂进行切换。
One pot synthesis of bioactive benzopyranones through palladium-catalyzed C–H activation and CO insertion into 2-arylphenols
Palladium-catalyzed oxidative carbonylation of 2-arylphenols throughC-H bond activation and C-C and C-O bond formation under acid-base free and mild conditions has been developed. The reaction tolerates a variety of substrates and provides biologically important benzopyranone derivatives in up to 87% isolated yield.
Synthesis of 7-Deoxypancratistatin from Carbohydrates by the Use of Olefin Metathesis
作者:Anders E. Håkansson、Anders Palmelund、Henriette Holm、Robert Madsen
DOI:10.1002/chem.200501429
日期:2006.4.12
stereocontrolled synthesis of (+)-7-deoxypancratistatin is described. The convergent synthesis has been achieved by two different strategies, both of which commence from a pentose and piperonal. The latter is converted into allylic bromide 7, which is then coupled with a protected methyl 5-deoxy-5-iodo-D-ribofuranoside in the presence of zinc metal. The first strategy involves a total of only 13 steps from D-ribose