Practical one-pot preparation of ketones from aryl and alkyl bromides with aldehydes and DIH via Grignard reagents
作者:Souya Dohi、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tet.2012.05.059
日期:2012.8
groups, such as ester, nitrile, ketone, and nitro groups with i-PrMgCl·LiCl or PhMgCl instead of Mg, also provided the corresponding diaryl and alkyl arylketones in good yields. The above methods are simple and practical transition-metal-free methods for the preparation of various diaryl ketones and alkyl arylketones bearing electron-rich aromatic groups and electron-deficient aromatic groups, as well
通过衍生自芳基或烷基溴化物的格利雅试剂的反应,然后与芳族或脂族醛的反应以及随后用1,3-二碘的处理,可以有效地以高收率高效地制备各种二芳基酮,烷基芳基酮和二烷基酮。一锅法中的-5,5-二甲基乙内酰脲和K 2 CO 3。相同的处理的芳族溴化物轴承吸电子基团,如酯,腈,酮和硝基与我-PrMgCl·LiCl或PhMgCl代替Mg,也以良好的收率提供了相应的二芳基和烷基芳基酮。以上方法是用于制备各种带有富电子芳族基团和缺电子芳族基团的二芳基酮和烷基芳基酮以及二烷基酮的简单且实用的无过渡金属的方法。
Stoichiometric Reactions of Acylnickel(II) Complexes with Electrophiles and the Catalytic Synthesis of Ketones
作者:Alexander C. Wotal、Ryan D. Ribson、Daniel J. Weix
DOI:10.1021/om5004682
日期:2014.10.27
While reactions with bromobenzene formed complex mixtures of ketones, reactions with α-chloroethylbenzene were highly selective for the cross-ketone product. Reactions with iodooctane and bromooctane also produced the cross-ketone product, but in intermediate yield and selectivity. In most cases the presence or absence of a chemical reductant (zinc) had only a small effect on the selectivity of the
酰基镍 (II) 配合物在形成酮的交叉亲电偶联 (XEC) 反应中具有突出的特征,但尚未系统地研究它们的反应性。我们在这里展示了我们对酰基镍 (II) 配合物与一系列碳亲电子试剂的反应性的研究。溴苯、α-氯乙苯、溴辛烷和碘辛烷与 (dtbbpy)Ni II (C(O)C 5 H 11 )(Br) ( 1b ) 和 (dtbbpy)Ni II (C(O)tolyl)(Br) 反应( 1c)形成多种有机产品。虽然与溴苯的反应形成复杂的酮混合物,但与 α-氯乙苯的反应对交叉酮产物具有高度选择性。与碘辛烷和溴辛烷的反应也产生交叉酮产物,但产率和选择性中等。在大多数情况下,化学还原剂(锌)的存在与否对反应的选择性只有很小的影响。1c与碘辛烷的偶联(产率 60%)转化为催化反应,即溴芳烃与伯溴烷烃的羰基化偶联(六个实施例,平均产率 60%)。
carbonylative C–C coupling of arylboronic esters with alkylhalides, allowing for the convergent synthesis of ketones. The system operates under mild conditions and exhibits complementary reactivity to Pd catalysis. The method is compatible with a wide range of arylboronic ester nucleophiles and proceeds smoothly for both primary and secondary alkyl iodide electrophiles. Preliminary mechanistic experiments
Oxidative Coupling of Alkenes with Aldehydes and Hydroperoxides: One-Pot Synthesis of 2,3-Epoxy Ketones
作者:Wen-Ting Wei、Xu-Heng Yang、Hai-Bing Li、Jin-Heng Li
DOI:10.1002/adsc.201400629
日期:2015.1.12
A new transition metal‐free oxidative coupling of unactivated terminal alkenes with aldehydes and hydroperoxides in the presence of 10 mol% potassium tert‐butanolate (t‐BuOK) is described thereby realizing trifunctionalization of alkenes toward 2,3‐epoxyketones. This method is applicable to a wide range of aldehydes, including aryl and alkyl aldehydes, with excellent functional group tolerance, and
Gold(I)-Catalyzed Synthesis of Highly Substituted 2-Cyclopentenones from 5-Siloxypent-3-en-1-ynes
作者:Sang Eun An、Jihee Jeong、Baburaj Baskar、Joopyung Lee、Junho Seo、Young Ho Rhee
DOI:10.1002/chem.200901824
日期:2009.11.9
More than a protective group! A highly efficient synthesis of 2‐cyclopentenones, possessing a quaternary carbon center, from 5‐siloxypent‐3‐en‐1‐ynes was discovered (see scheme). The reaction proceeded under very mild conditions to provide the products in high yield.