Asymmetric Construction of Spirocyclic Pyrrolidine-thia(oxa)zolidinediones via N,O-Ligand/Cu(I) Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with 5-Alkylidene Thia(oxa)zolidine-2,4-diones
作者:Wu-Lin Yang、Fei-Fei Tang、Fu-Sheng He、Chun-Yan Li、Xingxin Yu、Wei-Ping Deng
DOI:10.1021/acs.orglett.5b02387
日期:2015.10.2
asymmetric 1,3-dipolarcycloaddition of azomethineylides to 5-alkylidene thia(oxa)zolidine-2,4-diones catalyzed by a chiralN,O-ligand/Cu(CH3CN)4BF4 system is reported, affording structurally novel spirocyclic pyrrolidine-thia(oxa)zolidinediones with a spiro-heteroquaternary stereogenic center in good to excellent yields (up to 99%), with excellent levels of diastereo- and enantioselectivity (dr up to
On the Reactivity of the Exocyclic Double Bond in 5-Arylidene-3-aryl-2,4-thiazolidinediones; Their Reaction with Diazoalkanes, p-Thiocresol and Piperidine