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。
Reactions of acyl anions generated from acid chlorides and diiodosamarium
作者:J. Souppe、J-L. Namy、H.B. Kagan
DOI:10.1016/s0040-4039(01)81312-5
日期:1984.1
Acid chlorides react with SmI2 to give α-diketones. Various experiments show that the initially formed acyl radical is rapidly transformed into an acyl anion which is thus generated by quite an unusual route.
An efficient method for the direct preparation of high synthetic valuable a-hydroxycarbonyls is described. The simple and readily available I-2 or NBS was used as catalyst. DMSO acts as the oxidant, oxygen source, and solvent. A diverse range of tertiary Csp(3)-H bonds as well as more challenging secondary Csp(3)-H bonds could be hydroxylated in this transformation. The reaction is mild, less toxic and easy to perform.