Benzoxaborole antimalarial agents. Part 3: design and syntheses of (carboxy-13C-3,3-2H2)-labeled and (3-14C)-labeled 7-(2-carboxyethyl)-1,3-dihydro-1-hydroxy-2,1-benzoxaboroles
Enantioselective Synthesis of 6/5-Spirosilafluorenes by Asymmetric Ring Expansion of 4/5-Spirosilafluorenes with Alkynes
作者:Hua Chen、Haixia Zhang、Huimin Du、Yuzhong Kuang、Qinjiao Pang、Lu Gao、Wanshu Wang、Cheng Yang、Zhenlei Song
DOI:10.1021/acs.orglett.3c00346
日期:2023.3.10
A rhodium-catalyzed asymmetricring expansion of 4/5-spirosilafluorenes with terminal alkynes has been developed using sterically demanding binaphthyl phosphoramidite ligand. The reaction is not only strategically distinct from cyclization or cycloaddition but also showcases the first enantioselective synthesis of axially chiral 6/5-spirosilafluorenes.