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.
2-Amino-4-(alkoxymethyl)-1,3-butadienes react smoothly with nonactivated aldimines derived from aromatic aldehydes in the presence of ZnCl2 as Lewis acid giving rise, with good yields and very high stereoselectivity, to substituted 4-aminotetrahydropyridines which upon hydrolysis yield 4-piperidone derivatives. Moreover, the stereochemistry of the cyclization process depends on the nature of the N-substituent of the imine.
Stereoselective Synthesis of Seven-Membered Carbocycles from 2-Amino-1,3-butadienes and Vinyl Chromium Fischer-Type Carbenes
作者:Jose Barluenga、Fernando Aznar、Alfredo Martin、Jesus T. Vazquez
DOI:10.1021/ja00142a006
日期:1995.9
Seven-membered ring carbocycles are prepared by reaction of easily avaliable 2-amino-1,3-butadienes with vinyl Fischer carbenes. Hydrolysis of the cycloadduct initially formed gives rise to cyclohepta-1,3-diones with total regio- and stereoselectivity in a one-pot process. When 2-aminobutadienes bearing a prolinol derivative as a chiral auxiliary are used, the corresponding cyclic diketones are obtained with very high enantiomeric excesses. The absolute configuration of the stereogenic centers generated was determined with the aid of ROESY and CD measurements.
Barluenga Jose, Aznar Fernando, Valdes Carlos, Cabal Marfa-Paz, J. Org. Chem., 58 (1993) N 12, S 3391-3396
作者:Barluenga Jose, Aznar Fernando, Valdes Carlos, Cabal Marfa-Paz
DOI:——
日期:——
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
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.