Highly Efficient and Stereoselective Construction of Bispirooxindole Derivatives via a Three-Component 1,3-Dipolar Cycloaddition Reaction
作者:Qin Xu、De Wang、Yin Wei、Min Shi
DOI:10.1002/open.201402003
日期:2014.6
A highly regio‐ and stereoselective synthesis of bispirooxindoles by 1,3‐dipolar cycloaddition of in situ generated azomethine ylides from isatin and proline to different electron‐deficient alkenes has been developed. The synthesis affords the desired bispiro scaffold compounds in excellent yields with high regioselectivity under mild conditions. The stereochemistry was determined by single‐crystal
A series of novel dispirooxindole derivatives, 3-acetyl-5-phenyl-pyrrolo(spiro-[2.3']-1'-benzyl-oxindole)-spiro[4.3 '']-1 ''-benzyl-oxindoles, were synthesized via.1,3-dipolar cycloaddition of the azomethine ylide with 3-acetonylideneoxindole in high regioselectivities and yields. An unusual regioselectivity was observed in this 1,3-dipolar cycloaddition, leading to the construction of novel dispirooxindole skeleton. The substituent effects on the regioselectivity were also investigated.