Tandem Cycloaddition-Cyclopentannulation Processes of 2-Aminobuta-1,3-dienes and Fischer Alkynylcarbene Complexes as a Tool for the Preparation of Complex Polycyclic Scaffolds
Catalytic aminomercuration reactions of 3-alken-1-ynes: an improved method for the synthesis of 2-amino-1,3-butadienes and 1-aza-1,3-butadienes
摘要:
Catalytic aminomercuration of 3-alken-1-ynes leads to 1-aza-1,3-butadienes and 2-amino-1,3-butadienes. Under appropriate reaction conditions it is possible to prepare these compounds via mercuration of 3-alken-1-ynes in the presence of either aromatic or aliphatic primary and secondary amines. Depending on the substituents in the starting 3-alken-1-yne, the mercuration reaction may afford gamma-amino enamines instead of 2-amino-1,3-butadienes and 3-imino amines or 4-amino-1-aza-1,3-butadienes instead of 1-aza-1,3-butadienes.
An expeditious stereoselective synthesis of functionalized seven-membered carbocycles by reaction of 2-aminobuta-1,3-dienes with vinylchromium fischer type carbenes
作者:José Barluenga、Fernando Aznar、Alfredo Martín、Santiago García-Granda、Miguel A. Salvadó、Pilar Pertierra
DOI:10.1039/c39930000319
日期:——
2-aminobuta-1,3-dienes and pentacarbonyl-[1-methoxy-frans-3-(2-furyl)-prop-2-enylidene]-chromium(0) takes place at room temperature leading with total regio- and stereo-selectivity to functionalizedseven-memberedcarbocycles with good yields.
A new 2-aminobuta-1,3-diene derivative and its utility as a building block in hetero- and carbo-cyclization processes
作者:José Barluenga、Fernando Aznar、Maria-Paz Cabal、Felix Hernández Cano、M de la Concepción Foces-Foces
DOI:10.1039/c39880001247
日期:——
2-Morpholinobuta-1,3-diene cycloadds to aromatic aldehydes, N-benzylideneaniline, and methyl vinyl ketone, to give oxan-4-ones, 4-morpholinotetrahydropyridines, and 4-acetyl-1-morpholinocyclohexene derivatives, respectively, with a high degree of diastereoselectivity.
2-Morpholinobutadienes have been found to show different behaviour in the reaction with isocyanates and isothiocyanates. While isocyanates give rise always to openchain compounds, isothiocyanates yield mainly thiin1 derivatives.
Stereospecific [4+2] Reaction between 2-Morpholino-1,3-butadienes and α,β-Unsaturated Exocyclic Chromium Carbene Complexes. Preparation of Enantiomerically Pure Spiro Compounds
A stereospecific exoselective [4+2] reaction between α,β-unsaturated exocyclic chromium carbene complexes and 2-amino-1,3-butadienes is described. Its application employing homochiral carbene complexes gives rise to the optically pure spiro-lactones.
Unexpected and easy annulation of Fischer-type phenylethenyl carbene complexes
作者:Jos� Barluenga、Fernando Aznar、Sof�a Barluenga
DOI:10.1039/c39950001973
日期:——
The reaction between 2-aminobuta-1,3-dienes and Fischer-type phenylacetylenic carbene complexes leads under very mild conditions to highly functionalized dihydrofluorene derivatives in almost quantitative yields via annulation of a phenylethenyl carbene intermediate.