Methodology for Regioselective Synthesis of Substituted Pyridines via Intramolecular Oximino Malonate Hetero Diels−Alder Reactions
摘要:
Various substituted pyridines can be prepared regioselectively by a sequence involving an intramolecular thermal or high pressure Diels-Alder cycloaddition of an oximino malonate dienophile tethered to a dienic carboxylic acid, followed by mild aromatization of the resulting cycloadduct with cesium carbonate in DMF at room temperature.
Selectivity in retro-ene vs. cyclopentene rearrangements of a cis-methylvinylcyclopropane
作者:T. Hudlicky、F.J. Koszyk
DOI:10.1016/0040-4039(80)80107-9
日期:1980.1
6β-ethenyl-1β-methyl-bicyclo [3.1.0] hexane-2-one was examined at a wide range of temperatures and with diverse catalytic surfaces. Conditions are reported to effect selectivity between the retro-ene and the cyclopentene modes of rearrangement. The synthetic scope of these transformations is indicated.
<b>Alkyl- and Acylcobalt Carbonyls Containing Olefinic Unsaturation. II. Cyclization of 5-Hexenoylcobalt Tetracarbonyl and Nonterminal Olefin Complexes</b>
作者:R. F. Heck
DOI:10.1021/ja00903a014
日期:1963.10
<b>Triphenylphosphine Derivatives of π-Cyclopentenonylcobalt Tricarbonyls and their Dehydrogenation to π-Cyclopentadienonecobalt Dicarbonyl Triphenylphosphine Cations</b>