Molybdenum- and Rhenium-catalyzed Isomerization of Cyclopropanemethanols to Tetrahydrofurans
作者:Yasunari Maeda、Takahiro Nishimura、Sakae Uemura
DOI:10.1246/cl.2005.790
日期:2005.6
Molybdenum- and rhenium-complexes work as affective catalysts for isomerization of a variety of cyclopropanemethanols into the corresponding tetrahydrofurans in good to high yields. The reaction may proceed via 1) [3,3]sigmatropic rearrangement involving an oxo metal cyclopropanemethanolate accompanied by the C–C bond cleavage and 2) the metal-catalyzed intramolecular hydroalkoxylation of the initially produced homoallylic alcohols.
Intramolecular Displacement of Phenylselenone by a Hydroxy Group: Stereoselective Synthesis of 2-Substituted Tetrahydrofurans
作者:Lucio Minuti、Anna Barattucci、Paola Maria Bonaccorsi、Maria Luisa Di Gioia、Antonella Leggio、Carlo Siciliano、Andrea Temperini
DOI:10.1021/ol401653w
日期:2013.8.2
An efficient and stereocontrolled synthesis of 2-substituted tetrahydrofurans has been achieved. The approach employs the asymmetric reduction of γ-phenylseleno ketones obtained by three different procedures that are peculiarly applied to the synthesis of such compounds. Finally, the intramolecular substitution of the phenylselenone residue by the oxygen atom of a hydroxy group gives the tetrahydrofuran