Reinvestigation of palladium-catalyzed allylation of the monoacetate of 4-cyclopentene-1,3-diol and synthesis of the coronafacic acid ethyl ester
作者:Wataru Kinouchi、Yusuke Kosaki、Yuichi Kobayashi
DOI:10.1016/j.tetlet.2013.10.052
日期:2013.12
A larger quantity of a β-keto ester that is 1.5–1.7 equiv more than the base (t-BuOK, NaH) was found to be essential in securing sufficient yields of the products in the palladium-catalyzed allylic substitution of the monoacetate of 4-cyclopentene-1,3-diol with β-keto esters. This requirement also works well for substitutions with the TBS ether of the monoacetate and the monoacetate of 2-cyclohexene-1
发现在碱催化钯的烯丙基取代4的单乙酸酯中,要确保获得足够的产品收率,比碱(t -BuOK,NaH)多1.5-1.7当量的β-酮酯是必不可少的。 -环戊烯-1,3-二醇与β-酮酯。该要求对于用单乙酸酯的TBS醚和2-环己烯-1,4-二醇的单乙酸酯取代也很好。作为应用,合成了冠糖酸乙酯作为旋光形式。