Synthetic Studies and Mechanistic Insight in Nickel-Catalyzed [4+2+1] Cycloadditions
作者:Yike Ni、John Montgomery
DOI:10.1021/ja057741q
日期:2006.3.1
with alkynes tethered to dienes has been developed. A broad range of unsaturated substrates participate in the sequence, and stereoselectivities are generally excellent. Stereochemicalstudies provided evidence for a mechanism that involves the [3,3] sigmatropicrearrangement of divinylcyclopropanes.
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。
Synthesis of Nine-Membered Carbocycles by the [4+3+2] Cycloaddition Reaction of Ethyl Cyclopropylideneacetate and Dienynes
作者:Shinichi Saito、Kyotaro Maeda、Ryu Yamasaki、Takuya Kitamura、Minami Nakagawa、Korehito Kato、Isao Azumaya、Hyuma Masu
DOI:10.1002/anie.200907052
日期:2010.3.1
Various dienynes reacted efficiently with ethyl cyclopropylideneacetate in the presence of [Ni(cod)2]/PPh3, and cyclononadienes were synthesized in a selective manner. Dienynes tethered with aromatic rings were very good substrates, and the corresponding tricyclic compounds were isolated in high yields. The reaction provides a new route for the synthesis of nine‐membered carbocycles (see scheme).
Ni(acac)2 catalyzes the five-component connection reaction of Me2Zn, alkynes, diene (of 1,3-dien-8-ynes and 1,3-dien-9-ynes), aldehydes and anisidine to furnish cyclic dienyl amines anti-2 with high remote 1,5-diastereoselectivity.
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.