Ti-Catalyzed Diastereoselective Cyclopropanation of Carboxylic Derivatives with Terminal Olefins
作者:Jiabin Ni、Xiaowen Xia、Wei-Feng Zheng、Zhaobin Wang
DOI:10.1021/jacs.2c02360
日期:2022.5.4
cyclopropylamines from widely accessible carboxylic derivatives (acids, esters, amides) with terminal olefins. To the best of our knowledge, this method represents the first example of direct converting alkyl carboxylic acids into cyclopropanols. Distinct from conventional studies in Ti-mediated cyclopropanations with reactive alkyl Grignard reagents as nucleophiles or reductants, this protocol utilizes Mg
An Efficient Catalytic Friedel-Crafts Acylation Reaction of Equimolar Amounts of Aromatic Compounds and Free Carboxylic Acids or Their Trimethylsilylesters via Mixed Anhydrides
作者:Teruaki Mukaiyama、Kaoru Suzuki
DOI:10.1246/cl.1992.1751
日期:1992.9
In the presence of an active catalyst generated from SiCl4 and AgClO4, the Friedel-Crafts acylation reaction between equimolar amounts of aromatic compounds and mixed anhydrides, formed in situ from free carboxylic acids (or their trimethylsilylesters) and p-trifluoromethylbenzoic anhydride, smoothly proceeds at room temperature to afford the corresponding aromatic ketones in high yields.