A direct and efficient method for the preparation of 5-benzoyldihydro-2(3H)-furanones was realized by cyclization of 4-benzoylbutyric acids in the presence of phenyliodine(III) triflate.
The invention provides novel benzindole derivatives, processes for producing them, as well as a neuroprotective agent, an agent to prevent or treat diseases involving the degeneration, retraction or death of neurons, and an analgesic, each containing the benzindole derivatives as an active ingredient.
AbstractThe dehydrogenative Heck coupling (Fujiwara–Moritani reaction) of unactivated olefins with 3,4‐dihydro‐2H‐pyrans is described. The two main highlights of the work are the use of unconventional unactivated olefins as coupling partners in the palladium‐catalyzed reaction and the use of aprotic conditions for the coupling reaction of the acid‐labile dihydropyrans.magnified image
US6040331A
申请人:——
公开号:US6040331A
公开(公告)日:2000-03-21
Electrocatalytic Dehydrogenative Esterification of Aliphatic Carboxylic Acids: Access to Bioactive Lactones
A scalable and efficient electrocatalytic dehydrogenative esterification is reported. With an indirect electrolysis strategy, both intra- and intermolecular-type reactions were amenable to this practical method. With n-Bu4NI as the catalyst, undesired decarboxylation and Baeyer–Villiger oxidation were suppressed. More importantly, this novel method provided reliable and direct access to the natural