The first intramolecular enantioselective cyclopropanation of indenes and trisubstituted alkenes was accomplished by using new chiral phosphine X5 derived gold(I) complexes. This reaction is a straightforward, efficient method for constructing [5–3–6] fused-ring compounds with two vicinal all-carbon quaternary stereogenic centers, a core structure shared by numerous pharmacological products, and bioactive
Au(I)-Catalyzed Cyclization of Enynes Bearing an Olefinic Cycle
作者:Sang Ick Lee、Soo Min Kim、Mi Ra Choi、Sun Young Kim、Young Keun Chung、Won-Sik Han、Sang Ook Kang
DOI:10.1021/jo061254r
日期:2006.12.1
Gold(I)-catalyzed cyclization of enynes containing an olefinic cycle has been studied. The introduction of an olefinic ring instead of a terminal alkene in enynes dramatically increased the yield of the reaction. Enynes having an olefinic cycle were prepared by a rhodium-catalyzed intermolecular [4 + 2] cycloaddition of diynes with butadiene. Consecutive rhodium-catalyzed Diels−Alder/gold(I)-catalyzed