Chemoselective reduction of α,β-unsaturated carbonyl compounds in the presence of CuPd alloy nanoparticles decorated on mesoporous graphitic carbon nitride as highly efficient catalyst
作者:Melike Sevim、Cetin Bayrak、Abdullah Menzek
DOI:10.1016/j.jorganchem.2021.122181
日期:2022.1
reported reductions of acid, amide, ester and ketone groups with selectivity (>99%) by the catalytic transferhydrogenation of with CuPd alloy nanoparticles (NPs) decorated on mesoporous graphitic carbon nitride (Cu50Pd50/mpg-C3N4) catalyst under mild conditions in a water/methanol mixture. CuPd alloy NPs were synthesized by the co-reduction of palladium (II) acetylacetonate and copper(II) acetylacetonate
在此,我们报道了通过催化转移氢化与装饰在介孔石墨碳氮化物 (Cu 50 Pd 50 /mpg-C 3 N 4 ) 在温和条件下在水/甲醇混合物中的催化剂。CuPd 合金纳米粒子是通过乙酰丙酮钯 (II) 和乙酰丙酮酸铜 (II) 在油胺 (OAm) 溶液中通过吗啉-硼烷溶液的还原共还原合成的,然后在 mpg-C 3 N 4上组装通过液相自组装方法。α, β-不饱和羰基化合物由苯甲醛衍生物与丙酮衍生物缩合反应得到。Cu 50 Pd 50 /mpg-C 3 N 4纳米催化剂通过TEM、XRD、XPS、BET和ICP-MS表征。Cu 50 Pd 50 /mpg-C 3 N 4纳米催化剂是用于还原各种有机基团并转化为高产率和99%选择性的高活性催化剂。优越的Cu 50 Pd 50 /mpg-C 3 N 4 纳米催化剂是一种高效且可重复使用的催化剂,可在 5 个循环后重复使用,转化率为 98%。
A practical and additive-free method for the prenylation of chalcones using prenylzinc is reported. The protocol described is attractive because it provides access to a new class of prenylated chalcone derivatives derived from two classes of natural products in a simple, high-yielding and regioselective synthetic step. Furthermore, the application of other allylic reagents in our new protocol is demonstrated. A plausible mechanism that invokes steric factors to account for the α-regioselective outcome is proposed.
A highly enantioselectiveFriedel–Crafts (F–C) alkylation of pyrrole with a wide range of simple nonchelating chalcone derivatives catalyzed by a chiral (Zn2EtL)n (L = (S,S)-1) complex has been developed. The catalyst (Zn2EtL)n complex was prepared in situ by reacting the chiral ligand (S,S)-1 with 2 equiv of diethylzinc. A series of β-pyrrole-substituted dihydrochalcones were usually formed mostly