Facile Construction of Novel Polycyclic Ring Systems Using a Metallocarbenoid-Induced Cyclization of Acetylenic Diazo Carbonyl Compounds
作者:Albert Padwa、Christopher S. Straub
DOI:10.1021/ol006004q
日期:2000.7.1
Rh(II)-catalyzed reaction of diazo 2-propynyl maolonamic acid ester derivatives produce furo[3,4-c]furans in excellent yield. The methodology was applied to the synthesis of several polyheterocyclic systems by first generating a 2-alkoxy-substituted furan and then allowing it to undergo a subsequent intramolecularDiels-Alder cycloaddition. Ring opening of the resulting cycloadduct is followed by deprotonation
Synthesis of Furo[3,4-<i>c</i>]furans Using a Rhodium(II)-Catalyzed Cyclization/Diels−Alder Cycloaddition Sequence
作者:Albert Padwa、Christopher S. Straub
DOI:10.1021/jo020413d
日期:2003.1.1
acetate, afforded furo[3,4-c]furans in good yield. The reaction proceeds by addition of a rhodium-stabilized carbenoid onto the acetylenic pi-bond to give a vinyl carbenoid that subsequently cyclizes onto the neighboring carbonyl group to produce the furan ring. These furo[3,4-c]furans react with various dienophiles, furnishing anisole derivatives derived by loss of water from the initially formed Diels-Alder