通过三个步骤完成反式环烷基胺的非对映和对映选择性合成:(1)通过动态动力学拆分HCO 2 H / Et 3 N作为双环和单环α-取代的酮进行不对称转移氢化。氢源和基于TsDPEN -钌(II)催化剂,(2)的亲核的羟基向所得的叠氮取代的顺式改性Mitsunobu条件下使用-cycloalkanols二苯基磷叠氮化物,和(3)还原的反式-叠氮化物中间体与的LiAlH 4的PPh 3 / H 2 O达到所需目标。
Enantioselective Synthesis of Vicinal Halohydrins via Dynamic Kinetic Resolution
作者:Abel Ros、Antonio Magriz、Hansjörg Dietrich、Rosario Fernández、Eleuterio Alvarez、José M. Lassaletta
DOI:10.1021/ol052821k
日期:2006.1.1
[reaction: see text] Expanding the scope of enantioselective catalysis via DKR, transfer hydrogenation of a variety of cyclic alpha-halo ketones was accomplished using the Noyori/Ikariya (R,R)- or (S,S)-I catalysts and either HCO(2)H/Et(3)N or HCO(2)Na/n-Bu(4)NBr in H(2)O/CH(2)Cl(2) as the hydrogen sources. Good yields of vicinal bromo-, chloro-, and fluorohydrins with excellent de and ee levels were
The photoinduced reductive dehalogenation promiscuity of cyclohexanonemonooxygenase (CHMO) with a novel mechanism of ET/PT distinct from the photoinducedpromiscuity of natural reductases is reported. Various highly enantioenriched α-fluoroketones were synthesized by photoinduced reductive dehalogenation of α,α-halofluoroketones in a process catalyzed by the rationally designed CHMO mutants.
Chelation-Controlled Diastereoselective Reduction of α-Fluoroketones
作者:Pramod K. Mohanta、Todd A. Davis、Jeremy R. Gooch、Robert A. Flowers
DOI:10.1021/ja052546x
日期:2005.8.1
The effect of Ti-based Lewis acids on the reduction of alpha-fluoropropiophenone was examined to determine whether chelation control could be used to direct the diastereoselectivity of conversion to an alpha-fluoro alcohol. Pretreatment of alpha-fluoropropiophenone with TiCl4 followed by reduction with LiBH4 in diethyl ether or methylene chloride provided the syn diastereomer predominantly, while use of Ti(OiPr)4 under identical conditions provided the anti diastereomer as the major product. The products are consistent with a chelation-controlled mechanistic pathway in the former reduction and a nonchelation pathway in the latter case. Detailed 1H, 13C, and 19F NMR studies were consistent with chelation between TiCl4 and alpha-fluoropropiophenone under the reaction conditions utilized in this study. Reduction of other alpha-fluoroketones in the presence of TiCl4 also provided a high degree of diastereoselectivity in the conversion to alpha-fluoro alcohols, showing the generality of this approach.
Effect of acid catalysis on the direct electrophilic fluorination of ketones, ketals, and enamides using Selectfluor™
作者:Jack Liu、Johann Chan、Craig M. Bryant、Petar A. Duspara、Ernest E. Lee、David Powell、Hua Yang、Ziping Liu、Chris Walpole、Edward Roberts、Robert A. Batey
DOI:10.1016/j.tetlet.2012.03.074
日期:2012.6
The fluorination of ketones, ketals, and enamides has been achieved using the electrophilic fluorinating reagent Selectfluor™ (F-TEDA-BF4). For the reactions of ketones and ketals the use of sulfuric acid (0.1 equiv) as an additive was found to facilitate the reaction leading to more rapid product formation. This behavior is analogous to the known effects of acid catalysis on the bromination of ketones
Enantioselective synthesis of cis-α-substituted cycloalkanols and trans-cycloalkyl amines thereof
作者:Rosario Fernández、Abel Ros、Antonio Magriz、Hansjörg Dietrich、José M. Lassaletta
DOI:10.1016/j.tet.2007.04.075
日期:2007.7
diastereo- and enantioselective syntheses of trans-cycloalkyl amines was accomplished through a three-step sequence consisting of: (1) asymmetric transfer hydrogenation through dynamickineticresolution of bicyclic and monocyclic α-substituted ketones using HCO2H/Et3N as the hydrogen source and TsDPEN-based Ru(II) catalysts, (2) nucleophilic hydroxyl to azide substitution of the resulting cis-cycloalkanols
通过三个步骤完成反式环烷基胺的非对映和对映选择性合成:(1)通过动态动力学拆分HCO 2 H / Et 3 N作为双环和单环α-取代的酮进行不对称转移氢化。氢源和基于TsDPEN -钌(II)催化剂,(2)的亲核的羟基向所得的叠氮取代的顺式改性Mitsunobu条件下使用-cycloalkanols二苯基磷叠氮化物,和(3)还原的反式-叠氮化物中间体与的LiAlH 4的PPh 3 / H 2 O达到所需目标。