Mechanistic Studies and Improvement of Coinage Metal-Catalyzed Transformation of Alkynyloxiranes to Furans: An Alcohol Addition−Cyclization−Elimination Cascade
摘要:
In the presence of alcohol Ag or Au salts or complexes catalyze the conversion of alkynyloxiranes to substituted furans. Both-catalysts are effective, and a large furan diversity can be obtained in high yield with one or the other catalyst. Mechanistic studies revealed that a cascade pathway and not the sometimes reported direct intra molecular nucleophilic addition of oxirane oxygen atom to intermediate acetylene-metal pi-complex occurs. Under the defined conditions, the intermediate formation of epoxide opening products has been identified. Depending on the catalyst, one or both of the latter cyclized to dihydrofurans, and further elimination of the alcohol led to the corresponding furans. These results highlight the duality between oxophilicity and alkynophilicity of Ag or Au salts.
Silver(I)-Catalyzed Cascade: Direct Access to Furans from Alkynyloxiranes
摘要:
Functionalized furans are conveniently formed by a new silver(I)-catalyzed reaction of alk-1-ynyl oxiranes in the presence of p-toluenesulfonic acid and methanol. Evidence supported a cascade mechanism.
Denisov, V. R.; Lupaeva, M. L.; Alekseeva, E. M., Journal of Organic Chemistry USSR (English Translation), 1990, vol. 26, # 2.1, p. 251 - 256
作者:Denisov, V. R.、Lupaeva, M. L.、Alekseeva, E. M.、Schaumann, E.
DOI:——
日期:——
Untersuchungen �ber die Bildung von 2-Acylcyclopentanonen aus 1-(1-�thynyl)-cyclopentenen und Perameisens�ure
作者:Karl Eichinger
DOI:10.1007/bf01153928
日期:——
DENISOV, V. R.;LUPAEVA, M. L.;ALEKSEEVA, EH. M.;SHAUMANN, EH., ZH. ORGAN. XIMII, 26,(1990) N, S. 299-305
作者:DENISOV, V. R.、LUPAEVA, M. L.、ALEKSEEVA, EH. M.、SHAUMANN, EH.
DOI:——
日期:——
Denisov, V. R.; Khimich, G. N.; Shevchenko, Z. A., Russian Journal of Organic Chemistry, 1986, vol. 22, # 12, p. 2273 - 2278
作者:Denisov, V. R.、Khimich, G. N.、Shevchenko, Z. A.、Favorskaya, I. A.
DOI:——
日期:——
Silver(I)-Catalyzed Cascade: Direct Access to Furans from Alkynyloxiranes
作者:Aurélien Blanc、Katharina Tenbrink、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo900483m
日期:2009.6.5
Functionalized furans are conveniently formed by a new silver(I)-catalyzed reaction of alk-1-ynyl oxiranes in the presence of p-toluenesulfonic acid and methanol. Evidence supported a cascade mechanism.