Intramolecular [2 + 2] Cycloaddition Reactions of Alkynyl Ether Derived Ketenes. A Convenient Synthesis of Donor–Acceptor Cyclobutanes
作者:Vincent Tran、Thomas G. Minehan
DOI:10.1021/ol202989c
日期:2011.12.16
of tert-butyl alkynyl ethers furnishes aldoketenes, which undergo facile [2 + 2] cycloaddition reactions with pendant di- and trisubstituted alkenes. A wide variety of cis-fused cyclobutanones are produced in moderate to high diastereoselectivity and good to excellent yields by this method, and free hydroxyl groups are tolerated in the ene-ynol ether starting materials. Enol-ynol ethers also undergo
叔丁基炔基醚的温和热解提供醛烯,其与悬垂的二-和三取代烯烃发生容易的 [2 + 2] 环加成反应。通过这种方法可以以中等至高的非对映选择性和良好至极好的收率生产各种顺式稠合环丁酮,并且烯-炔醇醚起始材料中允许游离羟基。烯醇-炔醇醚也可以进行有效反应,以高产率生产供体-受体环丁烷。