through a sequence of rapid single-electron oxidation/[4+4] cyclization from 2,2′-disubstituted stilbene. The antarafacial manner of the thermally allowed [4+4] cyclization was further proven by series of control experiments and density functional theory calculations. Our findings provide an important addition to the aerobic copper-catalyzedoxidativecyclization.
Synthesis and fluoride ion - Triggered chemiluminescence (CIEEL mechanism) of siloxy-substituted benzofuran dioxetanes
作者:Waldemar Adam、Rainer Fell、Manfred H. Schulz
DOI:10.1016/s0040-4020(01)80366-5
日期:1993.3
The dioxetanes 2 with tert-butyldimethylsilyoxy-substituted aryl groups have been prepared from the corresponding benzofurans by photooxygenation and their fluoride ion-triggered CIEEL chemiluminescence was investigated; facile saponification by fluoride and even phenoxide ions of the aryl esters 4 is held responsible for the low chemiluminescence efficiencies.
Catalytic Hydroacylation as an Approach to Homoaldol Products
作者:Stephen K. Murphy、David A. Petrone、Matthew M. Coulter、Vy M. Dong
DOI:10.1021/ol202663p
日期:2011.12.2
A method has been developed for the intermolecular hydroacylation of homoallyl alcohols with salicylaldehydes to furnish homoaldol products In 50-98% yields. The method also applies to the hydroacylation of 2-hydroxystyrenes. This work highlights the use of hydroacylation as a unified approach to both aldol and homoaldol products.