Intramolecular N–Me and N–H aminoetherification for the synthesis of <i>N</i>-unprotected 3-amino-O-heterocycles
作者:Mahesh P. Paudyal、Mingliang Wang、Juha H. Siitonen、Yimin Hu、Muhammed Yousufuddin、Hong C. Shen、John R. Falck、László Kürti
DOI:10.1039/d0ob02122a
日期:——
A mild Rh-catalyzed method for synthesis of cyclic unprotected N–Me and N–H 2,3-aminoethers using an olefin aziridination–aziridine ring-opening domino reaction has been developed. The method is readily applicable to the stereocontrolled synthesis of a variety of 2,3-disubstituted aminoether O-heterocyclic scaffolds, including tetrahydrofurans, tetrahydropyrans and chromanes.
Oxidative Mizoroki-Heck-Type Reaction of Arylsulfonyl Hydrazides for a Highly Regio- and Stereoselective Synthesis of Polysubstituted Alkenes
作者:Fu-Lai Yang、Xian-Tao Ma、Shi-Kai Tian
DOI:10.1002/chem.201103671
日期:2012.2.6
hydrazides have been identified as synthetically useful aryl sources for the Pd(OAc)2 catalyzed oxidative Mizoroki–Heck‐type reaction under molecular oxygen to provide a convenient access to polysubstituted alkenes in a highly regio‐ and stereoselective manner (see scheme). The reaction well tolerates various functional groups such as alkoxy, halo, alcohol, carboxylic acid, ester, amide, sulfonamide, and
Hypervalent iodine initiated intramolecular alkene dimerisation: a stereodivergent entry to cyclobutanes
作者:Yuxiang Zhu、Ignacio Colomer、Timothy J. Donohoe
DOI:10.1039/c9cc04383g
日期:——
The emergence of newmethods for the stereoselectivesynthesis of strained carbocycles is a challenging but worthwhile endeavour. Cyclobutanes, in particular, have attracted the attention of both medicinal chemists and material scientists for their unique properties. Herein, we present a newmethod that allows access to highly functionalized cyclobutanes with complementary all-trans and trans–cis–trans
unexplored area for C−C bond formation. Herein 64 examples of β‐alkylated styrene derivatives, synthesized through the reactions of readily accessible feedstock olefins with β‐nitrostyrenes by ozone/FeII‐mediated radical substitutions, are reported. These reactions proceed with good efficiencies and high stereoselectivities under mild reaction conditions and tolerate an array of functional groups. Also demonstrated
烯烃C(sp 3)-C(sp 2)键的脱烯基烯基化作用一直是C-C键形成的未知区域。本文报道了64个β-烷基化苯乙烯衍生物的例子,这些例子是通过容易获得的原料烯烃与β-硝基苯乙烯通过臭氧/ Fe II介导的自由基取代反应而合成的。在温和的反应条件下,这些反应具有良好的效率和较高的立体选择性,并且可以耐受一系列官能团。还证明了该策略通过产品的几种合成转化以及天然产物异吗啡丁和药物(E)-美丹尼丁的合成的适用性。
An Enzymatic Platform for the Highly Enantioselective and Stereodivergent Construction of Cyclopropyl‐δ‐lactones
作者:Xinkun Ren、Ningyu Liu、Ajay L. Chandgude、Rudi Fasan
DOI:10.1002/anie.202007953
日期:2020.11.23
carbene transfer mechanism for the asymmetric synthesis of cyclopropane‐fused‐δ‐lactones, which are key structural motifs found in many biologically active natural products. While hemin, wild‐type myoglobin, and other hemoproteins are unable to catalyze this reaction, the myoglobin scaffold could be remodeled by protein engineering to permit the intramolecular cyclopropanation of a broad spectrum of homoallylic