The synthesis of α-hydroxyketones through the dioxygenation of alkynes is reported. The reaction is mediated by an Feporphyrin complex and pinacolborane at room temperature under air as a green oxidant, furnishing α-hydroxyketones in up to 93% yields. The mild reaction conditions allow chemoselective oxidation with good functional group tolerance.
DBU-Promoted Dynamic Kinetic Resolution in Rh-Catalyzed Asymmetric Transfer Hydrogenation of 5-Alkyl Cyclic Sulfamidate Imines: Stereoselective Synthesis of Functionalized 1,2-Amino Alcohols
作者:Hyeong Rae Kim、Raghavendra Achary、Hyeon-Kyu Lee
DOI:10.1021/acs.joc.8b01892
日期:2018.10.5
Dynamic kinetic resolution (DKR)-driven asymmetrictransferhydrogenation of 5-alkyl cyclic sulfamidate imine produces the corresponding sulfamidate with excellent levels of diastereo- and enantioselectivity by employing a HCO2H/DBU mixture as the hydrogen source in the presence of the Noyori-type chiral Rh-catalyst at room temperature for 1 h. In this process, DKR was induced by DBU-promoted rapid
通过动态动力学拆分(DKR)驱动的5-烷基环氨基磺酸亚胺的不对称转移氢化反应,通过在Noyori-存在下使用HCO 2 H / DBU混合物作为氢源,产生具有极佳非对映选择性和对映选择性的相应氨基磺酸盐型手性Rh催化剂在室温下放置1 h。在此过程中,DKR是由DBU促进的底物快速消旋作用诱导的。还描述了所得环状氨基磺酸盐向官能化对映体富集的1,2-氨基醇和手性胺物质的立体选择性转化。