Improved Dimethylsulfoxonium Methylide Cyclopropanation Procedures, Including a Tandem Oxidation Variant
作者:Richard Taylor、Richard Paxton
DOI:10.1055/s-2007-967966
日期:——
for the cyclopropanation of α,β-unsaturated carbonyl compounds and related systems is described which employs trimethylsulfoxonium iodide and an organic base in acetonitile to generate dimethylsulfoxoniummethylide in situ; in addition, preliminary results are described in which activated alcohols are converted directly into cyclopropyl ketones by a one-pot tandem oxidation-cyclopropanation sequence
A highly efficient approach to (Z)-conjugated enynes has been developed by utilizing an Au(III)-catalyzed ring opening reaction of 1-cyclopropyl-2-yn-1-ols with nucleophiles under mild conditions; the method is valuable due to the excellent yield and high regio- and stereoselectivity.
Chalcone-Based Synthesis of Tetrahydropyridazines via Cloke–Wilson-Type Rearrangement-Involved Tandem Reaction between Cyclopropyl Ketones and Hydrazines
作者:Yingfen Meng、Jiayi Gu、Meixiu Xin、Yi Jiang、Zhibo Du、Guoqing Lu、Jiayao Jiang、Albert S. C. Chan、Zhuofeng Ke、Yong Zou
DOI:10.1021/acs.joc.3c02824
日期:2024.2.16
A facile and efficient approach for the synthesis of multisubstituted tetrahydropyridazines starting fromcyclopropylketones and hydrazines has been developed. The transformation is chalcone-based and takes place via a Cloke–Wilson-type rearrangement-involved tandem reaction catalyzed by TfOH in HFIP.