Palladium(0)-Catalyzed Intramolecular Decarboxylative Allylation of Ortho Nitrobenzoic Esters
作者:Asik Hossian、Shantanu Singha、Ranjan Jana
DOI:10.1021/ol5017349
日期:2014.8.1
developed for the decarboxylative allylation of ortho-nitrobenzoic esters in an intramolecular fashion. In contrast to the typical sp2–sp3 cross-coupling approach which requires air and moisture sensitive preformed organometallic reagents, we provide an alternative route to the synthesis of ortho-allyl nitroarenes from the corresponding ortho-nitrobenzoic acid derivatives. The reaction proceeds through
Straightforward Strategy for the Stereoselective Synthesis of Spiro-Fused (C-5)Isoxazolino- or (C-3)Pyrazolino-(C-3)quinolin-2-ones from Baylis-Hillman Adducts by 1,3-Dipolar Cycloaddition and Reductive Cyclization
作者:Virender Singh、Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200800746
日期:2008.11
A straightforward and general approach for the stereoselectivesynthesis of spiro-fused (C-5)isoxazolino- or (C-3)pyrazolino-(C-3)quinolin-2-onesfrom the adducts offorded from the Baylis–Hillman reaction of 2-nitrobenzaldehyde and ethyl acrylate by sequential 1,3-dipolarcycloaddition and reductivecyclization is presented. It was found that the reductivecyclization of the isoxazoline derivatives
One‐pot sequentialHeckreduction–cyclization (HRC) reactions leading to the synthesis of substituted 2‐quinolones have been developed by using a heterogeneous or mixed homogeneous/heterogeneous multitaskpalladiumcatalyst with charcoal as a support. The whole sequence occurs under very mild conditions without the need for additives (ligand or base) by taking advantage of the high reactivity of aryldiazonium
High-yielding sequential one-pot synthesis of chiral and achiral α-substituted acrylates via a metal-free reductive coupling reaction
作者:Dhevalapally B. Ramachary、Chintalapudi Venkaiah、Y. Vijayendar Reddy
DOI:10.1039/c4ob00667d
日期:——
A general process for the high-yielding synthesis of substituted chiral and achiral α-substituted acrylates was achieved through the sequentialone-pot combination of a metal-free reductive coupling reaction followed by an Eschenmoser methylenation. The proline catalyzed reaction of Meldrum's acid, aldehydes and Hantzsch ester followed by methylenation was successful with Eschenmoser's salt in the