Rapid Access to Tricyclic Systems: Highly Endoselective Diels-Alder Reaction of Cycloalkenones with Cyclic Dienes Under Microwave Irradiation
作者:M. Karthikeyan、R. Kamakshi、V. Sridar、B. S. R. Reddy
DOI:10.1081/scc-120026847
日期:2003.12.31
Cis fused ring systems are synthesized in good yields under microwave irradiation conditions in the presence of AlCl3 as a catalyst within short time periods.
Electrophilic Phosphonium Cations as Lewis Acid Catalysts in Diels–Alder Reactions and Nazarov Cyclizations
作者:Maria Vogler、Lars Süsse、James H. W. LaFortune、Douglas W. Stephan、Martin Oestreich
DOI:10.1021/acs.organomet.8b00496
日期:2018.10.8
[(C6F5)3PF]+[B(C6F5)4]− is shown to catalyze Diels–Alderreactions of challenging dienophile/enophile combinations and Nazarov cyclizations of various precursors. Several other electrophilic phosphonium cations (EPCs) have been tested for comparison. This systematic study demonstrates the power of these Lewis acids to act as catalysts for synthetically useful pericyclic reactions.
高亲电性的氟阳离子[(C 6 F 5)3 PF] + [B(C 6 F 5)4 ] -已显示出催化Diels-Alder反应的挑战,挑战了亲二烯体/亲烯体的组合以及各种前体的纳扎罗夫环化。已测试了其他几种亲电phospho阳离子(EPC)进行比较。这项系统的研究证明了这些路易斯酸作为合成上有用的周环反应的催化剂的能力。