Intramolecular Reactions of Hydroperoxides and Oxetanes: Stereoselective Synthesis of 1,2-Dioxolanes and 1,2-Dioxanes
作者:Peng Dai、Patrick H. Dussault
DOI:10.1021/ol051407h
日期:2005.9.1
[reactions: see text] The 5-exo openings of oxetanes by hydroperoxides proceed rapidly and stereospecifically to furnish 1,2-dioxolanes. The corresponding 6-exo cyclizations are slower and proceed with moderate stereoselectivity. In the case of hydroperoxy acetals, 5-exo nucleophilic transfer of alkoxide competes effectively with 6-exo attack by the hydroperoxide.
[反应:见正文]氢过氧化物在oxetanes的5-exo开口中快速,立体定向地提供1,2-二氧戊环。相应的6-exo环化反应较慢,并以适度的立体选择性进行。在氢过氧缩醛的情况下,醇盐的5-exo亲核转移与氢过氧化物的6-exo攻击有效竞争。