Metal-catalyzed Organic Photoreactions. Photoreactions of Compounds Containing a Carbon-oxygen or Carbon-nitrogen Multiple Bond with Alcohols in the Presence of Titanium(IV) Chloride or Uranyl Chloride
作者:Tadashi Sato、Shigeo Yoshiie、Takashi Imamura、Kazumi Hasegawa、Masayuki Miyahara、Shigeo Yamamura、Osamu Ito
DOI:10.1246/bcsj.50.2714
日期:1977.10
α,β-Unsaturated carbonyl compounds and esters, cyclopropyl ketones, β-diketones, Schiff’s bases, and nitriles were irradiated in several alcohols in the presence of titanium(IV) chloride or uranyl chloride. In the titanium(IV) chloride-catalyzed reactions, the α-carbon atom of the primary alcohols underwent a bond formation, generally with the C=X (or C≡N) carbon atom of the substrates, while the bond
Study of photochemical addition of acyl radical to electron-deficient olefins
作者:Francisco A. Macías、José María G. Molinillo、Guillermo M. Massanet、Francisco Rodríguez-Luis
DOI:10.1016/0040-4020(92)85010-c
日期:1992.1
The photochemical addition of acyl radical to electron-deficient olefins is studied. The scope of the reaction, the mechanism, the role that molecular oxygen plays, the influence of steric effects, and the side reaction that take place are discussed. The reaction was carried out using a range of electron-withdrawingsubstituents (ketones, amides, lactones, nitrile and esters) with good yields of the
“An efficient and mild entry to 1,4-dicarbonyl compounds via photochemical addition of acyl radical to electron-deficient olefins”
作者:Francisco A. Macias、Jose Maria G. Molinillo、Isidro G. Collado、Guillermo M. Massanet、Francisco Rodriguez-Luis
DOI:10.1016/s0040-4039(00)89026-7
日期:——
Photoehcmical addition of acetaldehyde to electron-deficient olefins in the presence of molecular oxygen provides an efficient and mild method for the synthesis of 1,4-functionallzed compounds. Some considerations about the mechanism and the substituent effects are outlined.
In the presence of Pd(0) complexes, 2-ethoxy-2-propenyl diethyl phosphate was found to react with organotins to give the corresponding coupling products, showing to be a more efficient halo acetone equivalent compared with the corresponding acetate or carbonate. Reaction with tin enolates gave the 1,4-diketone in moderate to good yields.
Novel synthesis of 3H-pyrroles, and novel intermediates in the Paal–Knorr 1H-pyrrole synthesis: 2-hydroxy-3,4-dihydro-2H-pyrroles from 1,4-diketones and liquid ammonia
作者:Pak-Kan Chiu、Kon-Hung Lui、Prem Nath Maini、Michael P. Sammes
DOI:10.1039/c39870000109
日期:——
2-dimethyl-1,4-diketones with liquidammonia gives high yields of isolable 2-hydroxy-3,4-dihydro-2H-pyrroles (3) and (5) which are readily dehydrated to give separable mixtures of 3H-pyrroles and methylenedihydropyrroles, while less-substituted 1,4-diketones give analogous hydroxy-compounds (4) and (6) which are hitherto-unsuspected intermediates in the Paal–Knorr1H-pyrrolesynthesis.