of α,β-unsaturated methyl ketone/nitro compounds from benzylic amines through an oxidation–aldol/Henry reaction is reported. The reaction proceeded well by using MCPBA as oxidant and CuCl2·2H2O as catalyst. A variety of functionalized α,β-unsaturated methyl ketone/nitro compounds were assembled in moderate yields by application of this catalytic one-pot reaction.
Photocatalyzed Csp<sup>3</sup>–Csp<sup>3</sup> cross-dehydrogenative coupling of <i>N</i>-Boc-tetrahydroisoquinolines with α,β-unsaturated ketones
作者:Na-Ri-Mei Ao、Xue-Qing Zhu、Chun-Xin Zhao、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1039/d1ob00527h
日期:——
A novel photocatalyzed cross-dehydrogenative coupling reaction of N-Boc-tetrahydroisoquinolines with α,β-unsaturatedketones has been developed. This research provides an easy access to a variety of C1-substituted tetrahydroisoquinolines, which can be further transformed into benzo[a]-quinolizine-2-ones, the skeletons of natural products with a wide range of biological activities. The load of the photocatalyst
开发了一种新型光催化N -Boc-四氢异喹啉与 α,β-不饱和酮的交叉脱氢偶联反应。这项研究提供了一种容易获得各种 C1 取代的四氢异喹啉的方法,这些四氢异喹啉可以进一步转化为具有广泛生物活性的天然产物骨架苯并[ a ]-quinolizine-2-ones。光催化剂的负载量低,氧化剂便宜且毒性较小。
Synthesis of Enones and Enals via Dehydrogenation of Saturated Ketones and Aldehydes
作者:Gao-Fei Pan、Xue-Qing Zhu、Rui-Li Guo、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1002/adsc.201801058
日期:2018.12.21
substrate scope including various linear or cyclic saturated ketones and aldehydes. The protocol is ligand‐free, and molecular oxygen is used as the sole clean oxidant in the reaction. Due to mild reaction conditions, good functional group compatibility, and versatile utilities of enones and enals, the method can be applied in the late‐stage synthesis of natural products, pharmaceuticals and fine chemicals
diastereo-, and enantioselective Diels–Alderreaction of β,γ-unsaturated α-ketoesters with (E)-1-phenyl dienes has been accomplished by using a stable and easily available chiral N,N′-dioxide/zinc(II) complex as catalyst. Only one isomer of the corresponding cyclohexenes with three chiral centers was obtained in good to excellent yields with excellent ee values under mild reaction conditions. The configurations
of enantioenriched (hetero)aromatic secondary allylic alcohols has been synthesized through deracemization of the corresponding racemic mixtures combining a non-selective chemoenzymatic oxidation (laccase from Trametes versicolor and oxy-radical TEMPO) and a stereoselective biocatalyzed reduction (lyophilized cells of E. coli overexpressing an alcoholdehydrogenase, ADH). Both steps were performed in