Halogenation effects in intramolecular furan Diels–Alder reactions: broad scope synthetic and computational studies
作者:Robert L. Rae、Justyna M. Żurek、Martin J. Paterson、Magnus W. P. Bebbington
DOI:10.1039/c3ob41616j
日期:——
computational study of the effect of halogen substitution on both furan and dienophile for the intramolecularFuranDiels–Alder (IMDAF) reaction has been undertaken. Contrary to our initial expectations, halogen substitution on the dienophile was found to have a significant effect, making the reactions slower and less thermodynamically favourable. However, careful choice of the site of furan halogenation
Enantioselective Photocyclization of <i>N</i>-Alkylfuran-2-carboxyanilides to <i>trans</i>-Dihydrofuran Derivatives in Inclusion Crystals with Optically Active Host Compounds Derived from Tartaric Acid
The steric course of the photocyclization reaction of the title achiral compounds (1) to optically active trans-dihydrofuran derivatives (2) was controlled by carrying out the reaction in inclusion crystals (4) with optically active hosts (3) derived fromtartaricacid. The mechanism of the enantioselective reaction of 1 in 4 was studied by X-ray structural analysis of 4. In some cases, the steric
IntramolecularDiels–Alderreactions of various N-allyl 2-furoyl amides with different substituents on the nitrogen atom were investigated. The reaction of amides having bulky substituents proceeded at a faster rate than the analogs whose substituents were of less bulkiness. From the systematic experimental survey of the substituent effects and the energetic evaluation based on the DFT calculations