The CF<sub>3</sub>-DAST-induced deacylative trifluoromethylthiolation of cyclic 1,3-diketones/lactams/lactones and its extension to deacylative pentafluorophenylthiolation
CF3-DAST-induced deacylative trifluoromethylthiolation of cyclic 1,3-diketones lactams, and lactones that provides cyclic trifluoromethylthioketones, lactams and lactones is reported.
Exploring the Scope of Asymmetric Synthesis of β-Hydroxy-γ-lactams via Noyori-type Reductions
作者:Denis Lynch、Rebecca E. Deasy、Leslie-Ann Clarke、Catherine N. Slattery、U. B. Rao Khandavilli、Simon E. Lawrence、Anita R. Maguire、Nicholas A. Magnus、Humphrey A. Moynihan
DOI:10.1021/acs.orglett.6b02416
日期:2016.10.7
Enantio- and diastereoselective hydrogenation of β-keto-γ-lactams with a ruthenium–BINAP catalyst, involving dynamic kinetic resolution, has been employed to provide a general, asymmetric approach to β-hydroxy-γ-lactams, a structural motif common to several bioactive compounds. Full conversion to the desired β-hydroxy-γ-lactams was achieved with high diastereoselectivity (up to >98% de) by addition
A highly efficient Ir-catalyzed asymmetric hydrogenation of racemic β-keto lactams via dynamic kinetic resolution (DKR) for the synthesis of optically active β-hydroxyl lactams has been described. With the Ir-SpiroSAP catalyst, a series of racemic β-keto lactams including β-keto γ-, δ-, and ε-lactams were hydrogenated to chiral β-hydroxy lactams in high yields (87–99%) with excellent enantio- and
Here, we report a general method for the synthesis of quaternary and tertiary difluoromethylated compounds and their vinylfluoride analogues. The strategy, which relies on a two-step sequence featuring a C-selective electrophilic difluoromethylation and either a palladium-catalyzed decarboxylative protonation or a Krapcho decarboxylation, is practical, scalable, and high yielding. Considering the generality of the method and the attractive properties offered by the difluoromethyl group, this approach provides a valuable tool for late-stage functionalization and drug development.
A highly efficient ruthenium‐catalyzed asymmetric reductive amination (ARA) of racemic β‐keto lactams with molecular hydrogen and ammonium salts is disclosed for the synthesis of enantiomerically pure primary amino lactams through dynamickineticresolution (DKR). By this approach, a range of syn primary β‐amino lactams were obtained in high yields with high chemo‐, enantio‐, and diastereoselectivity