Amide‐phosphonium Salt Catalyzed Enantioselective Vinylogous Mannich Addition of Coumarins to Isatin Imines

An asymmetric vinylogous Mannich reaction between 3‐cyano‐4‐methylcoumarins and N‐Boc isatin imines catalysed by amide phosphonium salt is described. This method allows the formation of intriguing adducts bearing both 3‐aminooxindole and coumarin moieties in excellent yields with excellent enantiose...

Full description

Saved in:
Bibliographic Details
Published inChemCatChem Vol. 12; no. 2; pp. 444 - 448
Main Authors Wang, Jing, Zhang, Shuo, Ding, Weizhong, Wang, Chenghan, Chen, Jie, Cao, Weiguo, Wu, Xiaoyu
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 18.01.2020
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:An asymmetric vinylogous Mannich reaction between 3‐cyano‐4‐methylcoumarins and N‐Boc isatin imines catalysed by amide phosphonium salt is described. This method allows the formation of intriguing adducts bearing both 3‐aminooxindole and coumarin moieties in excellent yields with excellent enantioselectivities. The utility of this method was illustrated by a gram scale synthesis using as low as 0.1 mol % of catalyst without chromatographic purification, and removal of the Boc protecting groups on the primary amine functionality in Mannich products. Phosphine catalysis: Under 0.1 mol % of phosphonium salt catalyst, vinylogous Mannich reaction between 3‐cyano‐4‐methylcoumarins and N‐Boc isatin imines has been developed. This method allows the formation of intriguing adducts bearing both 3‐aminooxindole and coumarin moieties in excellent yields with excellent enantioselectivities. The utility of this method was illustrated by a gram scale synthesis without chromatographic purification, and removal of the Boc protecting groups on the primary amine functionality in Mannich products.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.201901677