Synergistic Relay Reactions To Achieve Redox‐Neutral α‐Alkylations of Olefinic Alcohols with Ruthenium(II) Catalysis
作者:Chen‐Chen Li、Jian Kan、Zihang Qiu、Jianbin Li、Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.201915218
日期:2020.3.9
the first Grignard-type nucleophilic addition using olefinicalcohols as latent carbonyl groups, providing a higher yield of the corresponding secondary alcohol than the classical hydrazone addition to aldehydes does. A broad scope of unsaturated alcohols and hydrazones, including some complex structures, can be successfully employed in this reaction, which shows the versatility of this approach and
作者:Wei Wei、Xi-Jie Dai、Haining Wang、Chenchen Li、Xiaobo Yang、Chao-Jun Li
DOI:10.1039/c7sc04207h
日期:——
Natural availability of carbonyl groups offers reductive carbonyl coupling tremendous synthetic potential for efficient olefin synthesis, yet the catalytic carbonyl cross-coupling remains largely elusive. We report herein such a reaction, mediated by hydrazine under ruthenium(II) catalysis. This method enables facile and selective cross-couplings of two unsymmetrical carbonyl compounds in either an
羰基的自然可用性为有效的烯烃合成提供了还原性羰基偶联的巨大合成潜力,但催化羰基的交叉偶联仍然很难实现。我们在本文中报道了在钌(II)催化下由肼介导的这种反应。该方法能够以分子间或分子内的方式使两种不对称羰基化合物容易且选择性地交叉偶联。此外,该化学物质可容纳多种底物,在温和的反应条件下以良好的官能团耐受性进行,并产生化学计量的良性副产物。重要的是,KO t Bu和双齿膦dmpe的共存对于这种转化至关重要。
Catalytic cycloaddition of diazoalkanes to fullerene C60
作者:A. R. Tuktarov、V. V. Korolev、D. Sh. Sabirov、U. M. Dzhemilev
DOI:10.1134/s1070428011010039
日期:2011.1
monosubstituted diazomethanes generated in situ by oxidation of aldehyde hydrazones in the presence of Pd(acac)2-2 PPh3-4 Et3Al as catalytic system resulted in selective formation of homofullerenes in which the alkyl substituent is located above the plane of the five-memberedring in C60. Under analogous conditions, unsymmetrical disubstituted diazomethanes generated from the corresponding ketone hydrazones gave
在作为催化体系的Pd(acac)2 -2 PPh 3 -4 Et 3 Al的存在下通过醛oxidation酮的氧化原位生成的单取代重氮甲烷在富勒烯C 60上的环加成反应导致选择性形成高富勒烯,其中烷基取代基位于其中在C 60中五元环的平面之上。在类似条件下,由相应的酮生成的不对称二取代重氮甲烷产生了立体异构的5,6-开口加合物的混合物。
Palladium-catalyzed selective cycloaddition of diazo compounds to [60]fullerene
The effective catalytic method for cycloaddition of higher diazoalkanes and diazoacetates to [60]fullerene in the presence of the three-component catalytic system Pd(acac)2–PPh3–Et3Al has been developed. The yield and selective formation of the target homo- and methanofullerenes are dependent upon the structure of the original diazocompounds.