Two new types of oxindole alkaloids, salacin and 3-oxo-7-hydroxy-3, 7-secorhyn-chophylline, have been isolated from the Thai medicinal plant Uncaria salaccensis.
METHOD FOR ISOLATION AND IDENTIFICATION OF (ESCHERICHIA COLI) 0157:H7 AND PLATING MEDIA FOR SAID PROCESS
申请人:R & F Products, Inc.
公开号:EP1045923B2
公开(公告)日:2008-01-23
Asymmetric Catalytic Double Michael Additions for the Synthesis of Spirooxindoles
作者:Tengfei Kang、Peng Zhao、Jian Yang、Lili Lin、Xiaoming Feng、Xiaohua Liu
DOI:10.1002/chem.201800043
日期:2018.3.12
Asymmetric cascade double Michael additions to construct 2′‐substituted 3,3′‐spirooxindoles by using a chiral guanidine organocatalyst has been developed. A series of spirooxindole derivatives containing dihydrofuran or pyrrolidine subunits were obtained with good to excellent diastereo‐ and enantioselectivities. The method showed great tolerance of a number of aromatic and aliphatic alkynones. The