Efficient construction of highly functionalized spiro[γ-butyrolactone-pyrrolidin-3,3′-oxindole] tricyclic skeletons via an organocatalytic 1,3-dipolar cycloaddition
作者:Long Wang、Xiao-Mei Shi、Wei-Ping Dong、Li-Ping Zhu、Rui Wang
DOI:10.1039/c3cc40669e
日期:——
Highly functionalized spiro[gamma-butyrolactone-pyrrolidin-3,3'-oxindole] tricyclic skeletons were delivered successfully with high optical purity using an effective yet simple procedure.
exo-Selective construction of spiro-[butyrolactone-pyrrolidine] via 1,3-dipolar cycloaddition of azomethine ylides with α-methylene-γ-butyrolactone catalyzed by Cu(i)/DTBM-BIPHEP
作者:Qing-Hua Li、Tang-Lin Liu、Liang Wei、Xiang Zhou、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c3cc45493b
日期:——
An expedient access to optically active spiro-[butyrolactone-pyrrolidine] was successfully developed via an unprecedented Cu(I)-catalyzed exo-selective 1,3-DC of azomethine ylides with α-methylene-γ-butyrolactone, which exhibited high diastereoselectivity (>98â:â2), excellent enantioselectivity (96â>99% ee) and a broad substrate scope under mild conditions.
Asymmetric Synthesis of Bispiro[γ-butyrolactone-pyrrolidin-4,4′-pyrazolone] Scaffolds Containing Two Quaternary Spirocenters via an Organocatalytic 1,3-Dipolar Cycloaddition
Enantiomerically enriched bispiro[γ‐butyrolactone‐pyrrolidin‐4,4′‐pyrazolone] skeletons were synthesized firstly through a simple organocatalytic 1,3‐dipolarcycloaddition reaction between α‐imino γ‐lactones and alkylidene pyrazolones, which afforded a diversity of bispirocyclic scaffolds in high yields and excellent diastereo‐ and enantioselectivities.
Stereoselective Construction of Spiro(butyrolactonepyrrolidines) by Highly Efficient Copper(I)/TF-BiphamPhos-Catalyzed Asymmetric 1,3-Dipolar Cycloaddition
作者:Tang-Lin Liu、Zhao-Lin He、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1002/chem.201103876
日期:2012.6.25
Pyrrole into one: The catalytic asymmetric1,3‐dipolarcycloaddition of cyclic aldimino esters has been accomplished for the first time, enabling facile access to spiro(butyrolactonepyrrolidines) containing one spiro quaternary center and three tertiary stereogenic centers (see scheme). The catalytic system performs well with a broad range of substrates, furnishing synthetically useful adducts in high