Synthesis of 4-Substituted 1,5-Dihydropyrrol-2-ones and 5,6-Dihydro-1H-pyridin-2-ones by Negishi Cross-Coupling Reactions: Short Access to the Antidepressant (±)-Rolipram
Synthesis of 4-Substituted 1,5-Dihydropyrrol-2-ones and 5,6-Dihydro-1H-pyridin-2-ones by Negishi Cross-Coupling Reactions: Short Access to the Antidepressant (±)-Rolipram
Preparation and Intramolecular [2+2]-Photocycloaddition of 1,5-Dihydropyrrol-2-ones and 5,6-Dihydro-1<i>H</i>-pyridin-2-ones with C-, N-, and O-linked Alkenyl Side Chains at the 4-Position
作者:Dominik Albrecht、Birte Basler、Thorsten Bach
DOI:10.1021/jo7027129
日期:2008.3.1
ion include the use of dichloromethane as the solvent and an irradiation with a mercury low-pressure lamp (λ = 254 nm). Upon applying these conditions at ambient temperature, the corresponding intramolecular photocycloaddition products 28−37 were obtained in good yields (52−79%) and with perfect diastereoselectivity. The constitution and configuration of the products was elucidated by NMR-spectroscopy
Synthesis of 4-Substituted 1,5-Dihydropyrrol-2-ones and 5,6-Dihydro-1<i>H</i>-pyridin-2-ones by Negishi Cross-Coupling Reactions: Short Access to the Antidepressant (±)-Rolipram
作者:Thorsten Bach、Dominik Albrecht
DOI:10.1055/s-2007-982553
日期:2007.6
A straightforward access to the title compounds was established by Pd-catalyzed Negishi cross-coupling reactions of the readily available bromides 3 and 6 with various functionalized zinc reagents (71-97% yield).