Solvent and catalyst-free bromofunctionalization of olefins using a mechanochemical approach
作者:Jonathan Wong、Ying-Yeung Yeung
DOI:10.1039/d1ra01816g
日期:——
Bromofunctionalizations of olefins are an important class of chemical transformations. N-Bromoimide reagents are commonly used in these reactions but catalysts and chlorinatedsolvents are often employed to achieve a reasonable reaction rate. In this report, we present a solvent and catalyst-free bromofunctionalization of olefins using mechanical force.
Catalytic Enantioselective Halolactonization of Enynes and Alkenes
作者:Wei Zhang、Na Liu、Casi M. Schienebeck、Kyle Decloux、Suqing Zheng、Jenny B. Werness、Weiping Tang
DOI:10.1002/chem.201103809
日期:2012.6.4
developed for the enantioselectivehalolactonization of (Z)‐1,3‐enynes and 1,1‐disubstituted alkenes. In the case of 1,3‐enynes, the carboxylate nucleophile and halogen electrophile were added to the conjugated π‐system from the same face. Up to 99 % ee was achieved for the 1,4‐syn‐bromolactonization of conjugated (Z)‐1,3‐enynes. Based on the results from the enynehalolactonization, a second generation
Nitrene‐Mediated Enantioselective Intramolecular Olefin Oxyamination to Access Chiral γ‐Aminomethyl‐γ‐Lactones
作者:Xin Nie、Clayton W. Ritter、Marcel Hemming、Sergei I. Ivlev、Xiulan Xie、Shuming Chen、Eric Meggers
DOI:10.1002/anie.202314398
日期:2023.12.18
Nitrene-mediated asymmetric intramolecularolefin difunctionalization is introduced, in which the nitrene intermediate adds in an unprecedented exocyclic fashion and the nucleophile in an endocyclic fashion. This atom-economic strategy affords chiral γ-aminomethyl-γ-lactones in high yields and excellent enantioselectivities and provides access to versatile chiral building blocks.