Palladium-Catalyzed Formal [4+2] Cycloaddition of Benzoic and Acrylic Acids with 1,3-Dienes via C-H Bond Activation: Efficient Access to 3,4-Dihydroisocoumarin and 5,6-Dihydrocoumalins
作者:Youwen Sun、Guozhu Zhang
DOI:10.1002/cjoc.201800149
日期:2018.8
cycloaddition of benzoic and acrylic acids with 1,3‐dienes including the stock chemicals 1,3‐butadiene and isoprene leading to synthetically useful 3,4‐dihydroisocoumarins and 5,6‐dihydrocoumalins. Stepwise C—H bond cleavage and annulation are likely involved in the reaction pathway. The synthetic potential of the methodology was demonstrated by two short derivatizations and total synthesis of natural product
我们报道了钯催化的苯甲酸和丙烯酸与1,3-二烯的正式分子间[4 + 2]环加成反应,包括化学原料1,3-丁二烯和异戊二烯,可合成3,4-二氢异香豆素和5,6-二氢香豆素。反应路径可能涉及逐步的CH键断裂和环化。该方法的合成潜力通过两次简短的衍生化和天然产物克劳拉明B的全合成得到证明。