Pd-catalyzed 5-endo-trig-type cyclization of β,γ-unsaturated carbonyl compounds: an efficient ring closing reaction to give γ-butenolides and 3-pyrrolin-2-ones
作者:Gan B. Bajracharya、Priti S. Koranne、Rashid N. Nadaf、Randa Kassem Mohamed Gabr、Kazuhiro Takenaka、Shinobu Takizawa、Hiroaki Sasai
DOI:10.1039/c0cc02352c
日期:——
The 5-endo-trig-type cyclization has been performed using a Pd-bis(isoxazoline) catalyst. The present cyclization of beta,gamma-unsaturated carbonylcompounds gave gamma-butenolides and 3-pyrrolin-2-ones in good to excellent yields.
A Cu-catalyzedasymmetric kinetic boron conjugate addition of γ-substituted α,β-unsaturated γ-lactams followed by oxidation is reported with good results. This strategy provides an efficient access to valuable enantioenriched α,β-unsaturated γ-lactams bearing simple γ-alkyl or aryl substituents, which showed inhibitory activities against cisplatin-sensitive ovarian cancer cells A2780. A new Lewis acid