Synthesis of Ti Complexes Supported by an <i>ortho</i>-Terphenoxide Ligand and Their Applications in Alkyne Hydroamination Catalysis
作者:Steven K. Butler、Ethan P. Ashbrook、Ian A. Tonks
DOI:10.1021/acs.organomet.2c00593
日期:——
of Ti complexes of an aryl-linked bis-phenoxide ligand, 3,3″-di-tert-butyl-5,5″-dimethyl-[1,1′:2′,1″-terphenyl]-2,2″-bis(olate), (TPO)H2, is reported. This ortho-linked terphenyl ligand builds on previously reported meta- and para-linked terphenyl-based ligands, completing the isomeric series of terphenoxide ligands. The 4-coordinate (TPO)Ti(NMe2)2 is an active catalyst for alkynehydroamination with
芳基连接的双酚盐配体 3,3″-二叔丁基-5,5″-二甲基-[1,1′:2′,1″-三联苯]的一系列 Ti 配合物的合成报道了-2,2”-双(油酸酯),(TPO)H 2 。这种邻位连接的三联苯配体建立在先前报道的间位和对位连接的三联苯配体的基础上,完成了三联苯醚配体的异构体系列。 4-配位(TPO)Ti(NMe 2 ) 2是一种用于炔烃与多种芳胺氢胺化的活性催化剂,在与不对称炔烃的反应中表现出良好的区域选择性。末端炔烃(例如苯乙炔)与关键的氮杂钛环丁烯中间体发生额外的插入反应,进一步证明芳氧基钛配合物容易受到这种进一步反应的影响。
Ito, Kunio; Miyajima, Shingo, Journal of Heterocyclic Chemistry, 1992, vol. 29, # 5, p. 1037 - 1044
作者:Ito, Kunio、Miyajima, Shingo
DOI:——
日期:——
Reversal of Diastereoselectivity in Reactions of the Trifluoroacetaldehyde Ethyl Hemiacetal with Enamines and Imines: Metal-Free, Complementary <i>anti</i>- and <i>syn</i>-Selective Synthesis of 4,4,4-Trifluoro-1-aryl-3-hydroxy-2-methyl-1-butanones
A complete reversal of diastereoselectivity was observed for reactions of the trifluoroacetaldehyde ethyl hemiacetal with enamines and imines, derived from propiophenones, that produce 4,4,4-trifluoro-1-aryl-3-hydroxy-2-methyl-1-butanones. This process serves as the first reliable, metal-free, complementary anti- and syn-selective method to prepare 4,4,4-trifluoro-1-aryl-3-hydroxy-2-methyl-1-butanones