Organic Iron for the PdCl2/FeCl3-Cocatalyzed Coupling Cyclization of 2,3-Allenoates in the Presence of Allylic Bromides
作者:Bo Chen、Shengming Ma
DOI:10.1002/chem.201002553
日期:2011.1.17
Newcoupling: The interaction of ferric chloride with 2,3‐allenoates generates a 2‐(5H)‐furanonyl iron species, which was observed to readily undergo transmetalation with PdCl2 to result in coupling with allylic bromides (see scheme). Based on this reaction, an efficient method for the synthesis of β‐allyl polysubstituted butenolides from the easily available allylic bromides and 2,3‐allenoates has
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