Elimination of β-Thioalkoxy Alcohols under Mitsunobu Conditions. A New Synthesis of Conjugated Enynes from Propargylic Dithioacetals
作者:Chih-Wei Chen、Tien-Yau Luh
DOI:10.1021/jo8013885
日期:2008.11.7
Treatment of propargylic dithiolanes 1 with (n)BuLi followed by a carbonyl electrophile yields the corresponding homopropargylic alcohol 3. Upon treatment with 2 equiv of PPh3 and DIAD, elimination of SR and OH moieties from 3 affords the corresponding olefins 4 in moderate to good yield. The reaction can be considered an alternative of McMurry coupling of two different carbonyl equivalents.
用(n)BuLi然后用羰基亲电试剂处理炔丙基二硫杂环戊烷1得到相应的均炔丙基醇3。用2当量的PPh3和DIAD处理后,从3中除去SR和OH部分得到相应的烯烃4,产率中等至良好。该反应可以被认为是两种不同的羰基当量的麦克默里偶联的替代方法。