Convenient and easy access to 2-hydroxycyclopent-2-enones from acylcyanohydrins
作者:Mathilde Pantin、Florent Bodinier、Jordan Saillour、Yassine M. Youssouf、Fabien Boeda、Morwenna S.M. Pearson-Long、Philippe Bertus
DOI:10.1016/j.tet.2019.07.010
日期:2019.8
A convenientaccess to 2-hydroxycyclopentenones was designed from acylcyanohydrins, by using titanacyclopropane complexes as nucleophilic partners and an intramolecular aldol condensation in basic conditions. The development of a one-pot procedure allows a step- and atom-economic process, and the use of Grignard reagents other than ethylmagnesium bromide provided valuable 3,4-disubstituted 2-hydroxycyclopentenones
Brønsted Acid-Catalyzed Formal [2 + 2 + 1] Annulation for the Modular Synthesis of Tetrahydroindoles and Tetrahydrocyclopenta[<i>b</i>]pyrroles
作者:Joshua A. Malone、Courtney E. Toussel、Frank R. Fronczek、Rendy Kartika
DOI:10.1021/acs.orglett.9b01032
日期:2019.5.17
An expedient synthesis of tetrahydroindoles and tetrahydrocyclopenta[ b]pyrroles, highlighted by Brønsted acid catalyzed formal [2 + 2 + 1] annulation reaction, is reported. Using three readily accessible reaction components, i.e., an electrophilic species in silyloxyallyl cations and two distinct nucleophiles in silylenol ethers and amines, our chemistry enables the assembly and functionalization