Fused bicyclic 4-pyrones were prepared by condensation of enamines derived from cyclic ketones with diketene or substituted 1,3-dioxin-4-ones. Photolysis in a hydroxylic medium led to bicyclo[n3.0]alkenones bearing oxygenation at both angular positions. This process is occurs via regioselective nucleophilic solvent attack on the intermediate tricyclic oxyallyl zwitterion. The efficiency of the transformation
Treatment of 2-methoxycarbonyl- (or 3-cyano-)allyl acetoacetates with a tertiary amine or triphenylphosphane afforded α-methylene γ-substituted δ-keto esters (or nitrile) in satisfactory yields. Various bases and nucleophiles were tested to elucidate the mechanism. The results of the study strongly suggest an intermolecular pathway involving a SN2′-decarboxylation-SN2′ cascade.
Reactive, Multifunctional Polymer Films through Thermal Cross-linking of Orthogonal Click Groups
作者:Jason M. Spruell、Martin Wolffs、Frank A. Leibfarth、Brian C. Stahl、Jinhwa Heo、Luke A. Connal、Jerry Hu、Craig J. Hawker
DOI:10.1021/ja207635f
日期:2011.10.19
cross-linked materials from soluble and processable organic polymers is dependent upon facile chemistries for both reinforcing the structure through cross-linking and for subsequent decoration with active functional groups. Generally, covalent cross-linking of polymeric assemblies is brought about by the application of heat or light to generate highly reactive groups from stable precursors placed along
Sato, Masayuki; Kanuma, Norio; Kato, Tetsuzo, Chemical and pharmaceutical bulletin, 1984, vol. 32, # 1, p. 106 - 116
作者:Sato, Masayuki、Kanuma, Norio、Kato, Tetsuzo
DOI:——
日期:——
Pseudocine substitution via internal delivery. Formal cyclopentadienone-ketone Michael adducts from 4-hydroxycyclopentenones
作者:F. G. West、Gamini U. Gunawardena
DOI:10.1021/jo00071a008
日期:1993.9
4-Hydroxycyclopentenones can be converted to 4-(2'-oxoalkyl)cyclopentenones in one pot upon treatment with diketene and DBU via intramolecular Michael addition of the intermediate beta-keto esters.