Enantioselective heterocyclic synthesis of spiro chromanone–thiochroman complexes catalyzed by a bifunctional indane catalyst
作者:Yaojun Gao、Qiao Ren、Hao Wu、Maoguo Li、Jian Wang
DOI:10.1039/c0cc03489d
日期:——
benzylidenechroman-4-ones and 2-mercaptobenzaldehydes for efficient construction of spiro chromanone-thiochroman complexes were accomplished with high yields and excellent selectivities via a novel bifunctional indane catalyst.
Asymmetric Three-Component Cyclizations toward Structurally Spiro Pyrrolidines via Bifunctional Phosphonium Salt Catalysis
作者:Lixiang Zhu、Xiaoyu Ren、Zhongxiu Liao、Jianke Pan、Chunhui Jiang、Tianli Wang
DOI:10.1021/acs.orglett.9b03282
日期:2019.11.1
Asymmetric multicomponent reactions toward optically pure compounds are highly attractive but extremely challenging. Presented herein is a highly diastereo- and enantioselectivethree-component cyclization of exocyclic alkenes with aldehydes and amino esters, which was enabled by bifunctional phosphonium salt catalysts. A wide range of multiply substituted spiro pyrrolidine derivatives were prepared
Highly efficient construction of chiral dispirocyclic oxindole/thiobutyrolactam/chromanone complexes through Michael/cyclization cascade reactions with a rosin-based squaramide catalyst
作者:Ning Lin、Xian-wen Long、Qing Chen、Wen-run Zhu、Bi-chuan Wang、Kai-bin Chen、Cai-wu Jiang、Jiang Weng、Gui Lu
DOI:10.1016/j.tet.2018.05.052
日期:2018.7
An efficient asymmetric Michael/cyclization cascade reaction of 4-chromanones with isothiocyanato oxindoles has been revealed. Under bifunctional organocatalysis by rosin-based squaramide catalyst, a series of spiro[oxindole/thiobutyrolactam/chromanone] complexes were conveniently constructed in a highly stereoselective manner (up to 99% yields, > 20:1 dr and >99% ee). The reaction leads to the formation