Stereoselective Synthesis of Furans by the Pd-Catalyzed Oshima−Utimoto Reaction
摘要:
The Pd-catalyzed coupling of acyclic allylic alcohols with vinyl ethers was examined and found to proceed with 2.5-10 mol % of catalyst and to provide cyclic acetals with good stereoselection. The reaction is tolerant of a number of functional groups and can be used to generate quaternary centers in a stereoselective fashion.
A new strategy for the preparation of an active Mn(0) and its use for radical cyclization reactions
作者:Jun Tang、Hiroshi Shinokubo、Koichiro Oshima
DOI:10.1016/s0040-4020(98)01205-8
日期:1999.2
Reduction of Li2MnCl4 with magnesium in THF afforded a fairly active manganese species which readily initiated radical cyclization of 2-iodoethanal allylic acetals at room temperature. The corresponding 2-bromoethanal acetals also provided the same cyclized products upon treatment with the activated manganese reagent at reflux in THF. This reagent can also be used to induce tandem radical cyclizations
Stereoselective Synthesis of Furans by the Pd-Catalyzed Oshima−Utimoto Reaction
作者:Michael A. Evans、James P. Morken
DOI:10.1021/ol051275s
日期:2005.7.1
The Pd-catalyzed coupling of acyclic allylic alcohols with vinyl ethers was examined and found to proceed with 2.5-10 mol % of catalyst and to provide cyclic acetals with good stereoselection. The reaction is tolerant of a number of functional groups and can be used to generate quaternary centers in a stereoselective fashion.