Catalytic Aerobic Oxidative Cleavage of Oximes, Tosylhydrazones and N,N-Dimethylhydrazones to Carbonyl Compounds
作者:Gonzalo Blay、Elisabeth Benach、Isabel Fernández、Sales Galletero、José R. Pedro、Rafael Ruiz
DOI:10.1055/s-2000-6347
日期:——
A new method for the aerobic oxidative cleavage of the C=N double bond of oximes and, tosyl- and N,N-dimethylhydrazones of ketones to yield their corresponding carbonyl compounds, with a Ni(II) complex catalyst, oxygen and pivalaldehyde has been developed.
A Facile Cleavage of Ketone N,N-Dimethylhydrazones by CeCl3 · 7 H2O-SiO2
作者:Jhillu S. Yadav、Basi V. Subba Reddy、M. Shashi K. Reddy、G. Sabitha
DOI:10.1055/s-2001-15161
日期:——
Ketone N,N-dimethylhydrazones are rapidly and chemoselectively deprotected to the corresponding ketones in high yields by CeCl3 · 7 H2O supported on silica gel under microwave irradiation. The method is compatible with acid sensitive substrates.
A new and efficient method for the hydrolytic cleavage of C=N bond of dimethyl and tosylhydrazones 1, to yield their corresponding carbonyl compounds 2, with catalytic quantities of bismuth trichloride in wet tetrahydrofuran under microwave irradiation has been developed.
Abstract In an environmentally benign solvent-free system, oximes and hydrazones are rapidly transformed into parent carbonylcompounds using peroxymonosulfate on silica gel under microwave irradiation in good to excellent yields.
Catalytic synthesis of β-lactam derivatives by carbonylative cycloaddition of acylsilanes with imines via a palladium Fischer-carbene intermediate
作者:Tetsuya Inagaki、Takuya Kodama、Mamoru Tobisu
DOI:10.1038/s41929-023-01081-5
日期:——
Fischer-type carbene complexes are characterized by the presence of a π-donating group, such as an alkoxy group on the carbene carbon. Despite the notable progress that has been made in synthetic methods that involve the use of Fischer-type carbene complexes, stoichiometric amounts of carbene complexes are still required for such reactions and catalytic variants remain elusive. This limitation primarily
费歇尔型卡宾配合物的特征在于存在π供体基团,例如卡宾碳上的烷氧基。尽管在涉及使用费舍尔型卡宾配合物的合成方法方面取得了显着进展,但此类反应仍然需要化学计量的卡宾配合物,并且催化变体仍然难以捉摸。这种限制主要源于缺乏合适的卡宾前体,这与带有吸电子基团的卡宾配合物可以很容易地从相应的重氮酯生成的事实形成鲜明对比。在这里,我们报道酰基硅烷可以通过钯催化剂的作用作为费歇尔卡宾配合物的前体。该体系可用于与亚胺的催化羰基环加成反应,形成密集取代的β-内酰胺衍生物。分离出一种关键的硅氧卡宾-钯中间体配合物,并成功地通过 X 射线晶体学进行了表征。