The Chemistry of<i>N</i>,<i>N</i>-Bis(siloxy)enamines. Part 8.A General Method for the Preparation of α-Azido Oximes from Aliphatic Nitro Compounds
作者:Alexey V. Lesiv、Sema L. Ioffe、Alexey Yu. Sukhorokov、Igor V. Bliznets、Yulija A. Khomutova、Yuriy A. Strelenko
DOI:10.1055/s-2005-861836
日期:——
A new convenient procedure for the preparation of a variety of α-hydroxy oximes from available aliphatic nitro compounds via intermediate N,N-bis(siloxy)enamines is presented. The mechanism of the key step, the rearrangement of N,N-bis(siloxy)enamines, is discussed.
A diastereo- and enantioselective propargylic substitution reaction between propargylic carbonates and α-substituted nitroacetates catalyzed by a Cu-pybox complex is described. This method allows the preparation of a series of non-proteinogenic quaternary α-aminoacid precursors featuring two contiguous stereogenic centers and a terminal alkyne moiety in high yields with good to excellent diastereo-
Umsetzungen von Dilithio-nitroalkanen und -allylnitroderivaten mit Carbonylverbindungen
作者:Friedrich Lehr、Jutta Gonnermann、Dieter Seebach
DOI:10.1002/hlca.19790620722
日期:1979.10.31
Reactions of dilithio-nitroalkanes and dilithio-allynitroalkanes with carbonyl compounds
二硫代-硝基烷烃和二硫代-烯丙基烷烃与羰基化合物的反应
Enantioselective Synthesis of Quaternary α-Amino Acids Enabled by the Versatility of the Phenylselenonyl Group
作者:Antonin Clemenceau、Qian Wang、Jieping Zhu
DOI:10.1002/chem.201604781
日期:2016.12.19
conjugate addition of α‐alkyl substituted α‐nitroacetates to phenyl vinyl selenone was developed. The resulting enantio‐enriched α,α‐dialkyl substituted α‐nitroacetates were subsequently converted to various cyclic and acyclic quaternary α‐amino acids, taking advantage of the rich functionalities of the resulting Michael adducts. Novel protocols allowing chemoselective reduction of phenyl selenone to
Enantioselective Addition of α‐Nitroesters to Alkynes
作者:Ryan T. Davison、Patrick D. Parker、Xintong Hou、Crystal P. Chung、Sara A. Augustine、Vy M. Dong
DOI:10.1002/anie.202014015
日期:2021.2.23
By using Rh–H catalysis, we couple α‐nitroesters and alkynes to prepare α‐amino‐acid precursors. This atom‐economical strategy generates two contiguous stereocenters, with high enantio‐ and diastereocontrol. In this transformation, the alkyne undergoes isomerization to generate a RhIII–π‐allyl electrophile, which is trapped by an α‐nitroester nucleophile. A subsequent reduction with In powder transforms
通过使用 Rh-H 催化,我们将 α-硝基酯和炔烃偶联以制备 α-氨基酸前体。这种原子经济策略产生两个连续的立体中心,具有高对映和非对映控制。在这种转化过程中,炔烃经过异构化生成 Rh III -π-烯丙基亲电子试剂,该亲电子试剂被 α-硝基酯亲核试剂捕获。随后用 In 粉末还原将烯丙基 α-硝基酯转化为相应的 α,α-二取代 α-氨基酯。