Pd(II)-Catalyzed Coupling Cyclization of 2,3-Allenoic Acids with Allylic Halides. An Efficient Methodology for the Synthesis of β-Allylic Butenolides
作者:Shengming Ma、Zhanqian Yu
DOI:10.1021/jo034511q
日期:2003.8.1
An effective method for the synthesis of beta-allyl polysubstituted butenolides from the easily available allylic halides and 2,3-allenoicacids is described. By using this method optically active butenolides can be obtained. According to the results presented in this paper, the reaction may proceed via three consecutive steps: cyclic oxypalladation of the allene, insertion of the C=C bond in allylic