A Mild and Efficient Three-Component Synthesis of Secondary and Tertiary Homoallylic Hydrazides
作者:Bum Seok Lee、Doo Ok Jang
DOI:10.1002/ejoc.201201757
日期:2013.5
Zn(ClO4)2·6H2O was developed for the syntheses of secondary and tertiary homoallylic hydrazides. Excellent chemoselectivities and diastereoselectivies were observed. Aldehydes as well as acyclic and cyclic ketones were well-suited to the reaction conditions and provided secondary and tertiary homoallylic hydrazides in excellent yields.
Highly Enantioselective Radical Addition to <i>N</i>-Benzoyl Hydrazones Using Chiral Ammonium Salts
作者:Doo Ok Jang、Sang Yoon Kim
DOI:10.1021/ja807685r
日期:2008.12.3
In the presence of a protonated cinchonine derivative, radicaladdition reactions proceeded efficiently, affording addition adducts in high yields with an extremely high enantioselectivity. The chiralammonium salt was recyclable after a simple aqueous workup. The reaction provides environmentally benign reaction conditions.
Radical “On Water” Addition to the C═N Bond of Hydrazones: A Synthesis of Isoindolinone Derivatives
作者:Tae Kyu Nam、Doo Ok Jang
DOI:10.1021/acs.joc.7b03193
日期:2018.7.20
A radical “on water” addition to the C═Nbond of hydrazones has been described. Hydrazone, diphenylsilane, alkyl iodide, and triethylborane afforded the corresponding addition products “on water” in good yields. A significant solvent effect was observed from the water. The developed protocol can be applied to the synthesis of 3-substituted isoindolinone derivatives. Moreover, the process offers environmentally
Iodine-catalysed oxidative cyclisation of acylhydrazones to 2,5-substituted 1,3,4-oxadiazoles
作者:Ganesh Majji、Saroj Kumar Rout、Srimanta Guin、Anupal Gogoi、Bhisma K. Patel
DOI:10.1039/c3ra44897e
日期:——
An environmentally benign synthesis of 2,5-disubstituted 1,3,4-oxadiazoles has been developed starting from N-aroylhydrazones and N-acetylhydrazones at room or ambient temperature using a catalytic quantity of iodine in the presence of an aqueous hydrogen peroxide oxidant.
Facile construction of novel imidazolidine-spirooxindoles via diastereoselective cycloaddition of N-acylhydrazine-derived imines with 3-isothiocyanato oxindoles
presence of 10 mol% of Na2CO3, the desired imidazolidine-spirooxindoles were obtained in 81–99% yield with up to 99 : 1 dr by means of the diastereoselective [3 + 2] cycloaddition of N-acylhydrazine-derived imines with 3-isothiocyanatooxindoles. Single-crystal X-ray structure analysis was conducted to determine the relative stereochemistry of the imidazolidine-spirooxindoles. Diastereoselective access
在存在10 mol%的Na 2 CO 3时,通过衍生自N-酰基肼的非对映选择性[3 + 2]环加成反应,可以81-99%的收率获得所需的咪唑烷-螺氧并吲哚,最高可达99:1 dr。亚胺与3-异硫氰酸根合吲哚。进行了单晶X射线结构分析,以确定咪唑烷-螺氧还吲哚的相对立体化学。拟议的机制假设非对映选择性进入咪唑烷-spirooxindoles。