The AuI‐catalyzed reaction of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with azomethine imines regio‐ and diastereoselectively affords furo[3,4‐d]tetrahydropyridazines in a tandem cyclization/intermolecular [3+3]‐cycloaddition process under mild conditions. By employing a chiral gold catalyst (prepared in situ from a Taddol‐derived phosphine‐phosphite ligand, Me2SAuCl, and AgOTf) high yields and enantioselectivities
The phosphine-catalyzed [3 + 2] and [3 + 3] annulation reactions of azomethineimines and ethyl 2-butynoate were developed, providing 1,2-dinitrogen-containing heterocycles tetrahydropyrazolopyrazo...
The first thiourea catalysed asymmetric [3 + 2] cycloaddition reaction between azomethine imines with malanonitriles was devoloped. With this novel synthetic stratagy, hybrid molecules containing N,N - bicyclic pyrazolidinones fused...
Organocatalytic azomethine imine-olefin click reaction: high-yielding stereoselective synthesis of spiroindane-1,3-dione-pyrazolidinones
作者:Dhevalapally B. Ramachary、T. Prabhakar Reddy、A. Suresh Kumar
DOI:10.1039/c6ob01009a
日期:——
search of developing new useful “click reactions”, herein we report the organocatalytic azomethine imine-olefin [3 + 2]-cycloaddition as a new click reaction for the synthesis of drug-like spiroindane-1,3-dione-pyrazolidinones from indane-1,3-diones, aldehydes and N,N-cyclic azomethine imines through amino acid-catalysis. The scope of this new click reaction is demonstrated using many examples with
Chiral NHC-catalyzed 1,3-dipolar [3 + 2] cycloaddition of azomethine imines with α-chloroaldehydes for the synthesis of bicyclic pyrazolidinones
作者:Limin Yang、Yunbo Lv、Fei Wang、Guofu Zhong
DOI:10.1039/c8ob00925b
日期:——
A chiral N-heterocyclic carbene (NHC)-catalyzed 1,3-dipolar [3 + 2] cycloaddition reaction of 3-oxopyrazolidin-1-ium-2-ides and α-chloroaldehydes was developed for the synthesis of pyrazolo[1,2-a]pyrazole-1,7-diones in moderate to good yields (up to 76%) with good enantioselectivities (up to 98% ee) and diastereoselectivities (up to 8 : 1 dr).