Beyond Benzoin Condensation: Trimerization of Aldehydes via Metal-Free Aerobic Oxidative Esterification of Aldehydes with Benzoin Products in the Presence of Cyanide
作者:Yoo-Jin Kim、Na Yeun Kim、Cheol-Hong Cheon
DOI:10.1021/ol5008845
日期:2014.5.2
trimerization of aldehydes in the presence of cyanide via metal-freeaerobicoxidativeesterification under ambient conditions is described. Various aromatic aldehydes provided the corresponding oxidativeesterification products in good to excellent yields. Mechanistic studies suggested that this reaction would proceed via a two-step sequence: cyanide-catalyzed benzoin condensation of aldehydes and subsequent
A New Site Selective Synthesis of Benzoin Esters. Synthesis of Symmetrically and Unsymmetrically Substituted Benzils
作者:Diego Armesto、William M. Horspool、Maria J. Ortiz、Rafael Perez-Ossorio
DOI:10.1055/s-1988-27712
日期:——
A series of novel benzoin esters has been obtained in high yield, in a site selective synthesis, by the acid hydrolysis of a series of 4-benzoyloxy-2-azabuta-1, 3-dienes. The oxidation of the benzoin esters allows the preparation of symmetrically and unsymmetrically substituted benzils by a route that is superior, in some cases, to those previously reported.
Reactions of Aroyl Chlorides with Samarium Metal in DMF—Controllable Syntheses of<i>O</i>‐Aroylbenzoins, 1,2‐Diarylethanones, and (<i>Z</i>)‐α,α′‐Stilbenediol Dibenzoates
作者:Yongjun Liu、Xiaoxia Wang、Yongmin Zhang
DOI:10.1081/scc-200034825
日期:2004.12.31
Abstract Reduction of aroyl chlorides carried out in DMF with samarium metal has been studied. Samarium metal, which requires not any intended activation or pretreatment, was found to react with aroyl chloride in a controllable manner. Correspondingly, O‐aroylbenzoins, 1,2‐diarylethanones, or (Z)‐α,α′‐stilbenediol dibenzoates were afforded as the major products under controlled conditions.