Enzymatic construction of highly strained carbocycles
作者:Kai Chen、Xiongyi Huang、S. B. Jennifer Kan、Ruijie K. Zhang、Frances H. Arnold
DOI:10.1126/science.aar4239
日期:2018.4.6
Double rings made with heme Cyclic organic structures with adjacent three-carbon rings—bicyclobutanes—are useful starting materials for chemical and materials synthesis owing to their extreme ring strain. Constructing these molecules is a challenging task for organic chemists, especially if a single stereoisomer is desired. Chen et al. engineered a heme-containing enzyme to catalyze sequential carbene
A New Chiral Rh(II) Catalyst for Enantioselective [2 + 1]-Cycloaddition. Mechanistic Implications and Applications
作者:Yan Lou、Manabu Horikawa、Robin A. Kloster、Natalie A. Hawryluk、E. J. Corey
DOI:10.1021/ja047064k
日期:2004.7.1
A novel chiral Rh(II) catalyst (1) is introduced for the [2 + 1]-cycloaddition of ethyl diazoacetate to terminal acetylenes and olefins with high enantioselectivity. The catalyst 1 consists of one acetate bridging group and three mono-N-triflyldiphenylimidazoline-2-one bidentate ligands (DPTI) spanning the Rh(II)-Rh(II) metallic center in a structure that was determined by single-crystal X-ray diffraction