通过有机氟化物独特的氟效应对脱氟功能化的研究兴趣导致了该主题的快速发展。在此,我们报道了一种前所未有的烯丙基氟化物、脒和 Cs 2 CO 3的四组分脱氟反应,用于在无过渡金属条件下方便地合成有价值的含嘧啶脒氨基氨基甲酸酯。实现多键串联协议的合成关键依赖于α位羟基的定向功能和烯丙基氟化物中全氟烷基取代基的活化作用。此外,碳酸铯作为绿色羰基等价物用于正式的 CO 捕获。机理研究表明,反应通过一种可能的环状碳酸酯中间体。
Readily available propargyl alcohols were found to be useful substrates for the copper(I)-catalyzed synthesis of β,γ-unsaturated amides. Nucleophilic attack by the alcohol on the in situ generated ketenimine followed by base-catalyzed elimination and subsequent ring opening yields the desired products under mild conditions.
1-Chloroalkyl<i>p</i>-Tolyl Sulfoxides as Acetylide Anion Equivalent: A Novel Synthesis Including Asymmetric Synthesis of Propargylic Alcohols from Carbonyl Compounds
作者:Tsuyoshi Satoh、Yasumasa Hayashi、Koji Yamakawa
DOI:10.1246/bcsj.64.2153
日期:1991.7
Addition of the carbanion of 1-chloroalkyl p-tolyl sulfoxide to carbonyl compounds gave the adducts, which were heated in refluxing toluene or xylene to give vinyl chlorides in high overall yield. Dehydrochlorination of the vinyl chlorides with excess n-BuLi afforded propargylic alcohols in high yields. Asymmetric synthesis of both enantiomers of the propargylic alcohols was realized using optically
Research interest in defluorinative functionzalization by means of the distinctive fluorine effect of organofluorides has led to rapid development in this topic. Herein, we reported an unprecedented four-component defluorinative reaction of allylic fluorides, amidines, and Cs2CO3 for the convenient synthesis of valuable pyrimidine-containing amidino carbamates under transition-metal-free conditions
通过有机氟化物独特的氟效应对脱氟功能化的研究兴趣导致了该主题的快速发展。在此,我们报道了一种前所未有的烯丙基氟化物、脒和 Cs 2 CO 3的四组分脱氟反应,用于在无过渡金属条件下方便地合成有价值的含嘧啶脒氨基氨基甲酸酯。实现多键串联协议的合成关键依赖于α位羟基的定向功能和烯丙基氟化物中全氟烷基取代基的活化作用。此外,碳酸铯作为绿色羰基等价物用于正式的 CO 捕获。机理研究表明,反应通过一种可能的环状碳酸酯中间体。