Sequential Platinum‐Catalyzed Cycloisomerization and Cope Rearrangement of Dienynes
作者:Sun Young Kim、Youjung Park、Young Keun Chung
DOI:10.1002/anie.200905361
日期:2010.1.8
Enyne‐enyne‐o: Tandem cycloisomerization of dienynescatalyzed by platinum dichloride and subsequent Coperearrangement affords bicyclic rings (see scheme; Z=NTs, O, CH2), such as bicyclo[3.2.2]nonadienes 1 or tetrahydrocyclohepta[c]pyrans and ‐pyridines 2, in high yields.
烯炔-烯炔:二氯化铂催化的二烯的串联环异构化和随后的Cope重排提供双环(见方案; Z = NTs,O,CH 2),例如双环[3.2.2]壬二烯1或四氢环庚基[ c ]吡喃和吡啶2,高产。
Desymmetrization of meso-dienyne by asymmetric Pauson–Khand type reaction catalysts
作者:Nakcheol Jeong、Dong Hoon Kim、Jun Hun Choi
DOI:10.1039/b401288g
日期:——
Desymmetrization of the meso dienynes, such as propargyl 1-vinylallyl N-tosylamides (1aâc) and propargyl 1-vinylallyl ethers (1dâe), by asymmetric PausonâKhand type reaction catalysts was studied. The corresponding vinyl substituted bicyclic pentenones (2 and 3) were obtained with high diastereoselectivity and enantioselectivity.
作者:Sang Ick Lee、Se Yeoun Park、Ji Hoon Park、Il Gu Jung、Soo Young Choi、Young Keun Chung、Bun Yeoul Lee
DOI:10.1021/jo051685u
日期:2006.1.1
A rhodium complex of N-heterocyclic carbene (NHC) has been developed for intra- and intermolecular [4 + 2] and intramolecular [5 + 2] cycloadditionreactions. This is the first use of a transition-metal NHC complex in a Diels−Alder-type reaction. For the intramolecular [4 + 2] cycloadditionreactions, all the dienynes studied were converted to their corresponding cycloadducts in 91−99% yields within
Au(PPh3)OPOF2-catalyzed intramolecular [4+2] cycloaddition reaction of dienynes
作者:Soo Min Kim、Ji Hoon Park、Young Keun Chung
DOI:10.1039/c1cc11127b
日期:——
Solvolysis of Au(PPh(3))PF(6) afforded Au(PPh(3))OPOF(2) which is an effective catalyst in the intramolecular [4+2] cycloaddition of unactivated dienynes bearing a terminal alkyne.
Selectivity in Cobalt Carbonyl Mediated Cycloaddition of Dienynes
作者:Young Keun Chung、Kang Hyun Park、Soo Young Choi、So Yeon Kim
DOI:10.1055/s-2006-932466
日期:——
Dicobalt octacarbonyl mediated cycloaddition of dienynes in the presence of carbon monoxide has been studied. Three main competing reaction routes, two carbonylative cycloaddition reactions and a Diels-Alder reaction, have been recognized depending upon the substrate and reaction conditions. Judicious design of the substrate and selection of reaction conditions allow control of the reaction pathway.