Stereo- and Regioselective Palladium-Catalysed Hydroarylation and Hydrovinylation of Functionalised Alkynes: a Route to Substituted <i>Z</i>-2-Cinnamyl Esters, 3-Chromen-2-ols, and Coumarins
作者:Sandro Cacchi、Giancarlo Fabrizi、Leonardo Moro、Paola Pace
DOI:10.1055/s-1997-1040
日期:——
The palladium-catalysed hydroarylation and hydrovinylation of methyl 3-phenylpropynoate and 3,3-diethyoxy-1-(o-tetrahydropyranyloxy)phenyl-1-propyne with aryl and vinyl halides or triflates in the presence of Pd(OAc)2 and KOOCH has been studied. The reaction affords stereoselectively syn addition products. The regiochemical outcome appears to be controlled by steric effects and the new carbon-carbon bond is generated preferentially on the carbon far from the aromatic ring ligated to the acetylenic carbon. The reaction can be applied to the synthesis of 3-substituted-3-chromen-2-ols and 3-substituted coumarins.
钯催化的甲基3-苯基丙炔酸酯和3,3-二乙氧基-1-(o-四氢吡喃氧基)苯基-1-丙炔与芳基和乙烯基卤化物或三氟甲磺酸盐在Pd(OAc)2和KOOCH存在下的氢芳基化和氢乙烯基化反应已被研究。反应选择性地得到顺式加成产物。区域化学结果似乎受空间效应控制,新的碳-碳键优先在远离与炔碳连接的芳环的碳上生成。该反应可应用于3-取代的3-色满-2-醇和3-取代的香豆素的合成。