Direct Imine Acylation: Synthesis of the Proposed Structures of ‘Upenamide
作者:William P. Unsworth、Katherine A. Gallagher、Mickaël Jean、Jan Peter Schmidt、Louis J. Diorazio、Richard J. K. Taylor
DOI:10.1021/ol3030764
日期:2013.1.18
The synthesis of the two proposed structures of macrocyclic marine natural product ‘upenamide is reported. The key step utilizes directimineacylation (DIA) with a protected β-hydroxy acid to construct the key tricyclic ABC ring system. The macrocyclization was completed in the final step using a Stille cross-coupling reaction.
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