The ruthenium‐catalyzed dehydrogenation of alcohols in the presence of N,N'‐diisopropylcarbodiimide in toluene under neutral conditions proceeded smoothly to give corresponding carbonylcompounds in good to excellent yields with good functional group tolerance. This is the first report for the use of carbodiimide as a hydrogen acceptor for dehydrogenative oxidation of alcohols. Kinetic analysis for
Selective Mono Addition of Aryllithiums to Dialdehydes by Micromixing
作者:Aiichiro Nagaki、Hiroki Yamashita、Yusuke Takahashi、Satoshi Ishiuchi、Keita Imai、Jun-ichi Yoshida
DOI:10.1246/cl.170899
日期:2018.1.5
Micromixing enables highly selective mono addition of aryllithiums to dialdehydes. Because the unchanged formyl group in the products can be used for further transformations, the present approach serves as a powerful method for protecting-group-free synthesis.
The use of 1,4-phenylene-containing tripyrrane analogs provides a general route to expanded p-benziporphyrins. The course of macrocyclization shows a striking dependence on the steric bulk of meso substituents.
Catalytic Electrophilic Alkylation of<i>p</i>-Quinones through a Redox Chain Reaction
作者:Xiao-Long Xu、Zhi Li
DOI:10.1002/anie.201702885
日期:2017.7.3
Allylation and benzylation of p‐quinones was achieved through an unusual redox chain reaction. Mechanistic studies suggest that the existence of trace hydroquinone initiates a redox chain reaction that consists of a Lewis acid catalyzed Friedel–Crafts alkylation and a subsequent redox equilibrium that regenerates hydroquinone. The electrophiles could be various allylic and benzylic esters. The addition
An unusual chemoselective oxidation strategy by an unprecedented exploration of an electrophilic center of DMSO: a new facet to classical DMSO oxidation
作者:Rajesh Chebolu、Ashish Bahuguna、Reena Sharma、Vivek Kumar Mishra、P. C. Ravikumar
DOI:10.1039/c5cc05713b
日期:——
A conceptually new dimethyl sulfoxide (DMSO) based oxidation process without the use of any activator has been demonstrated for the oxidation of active methylenes and benzhydrols.