RESUMO
A Rh(I)-catalyzed [5 + 2]/[2 + 2] cycloaddition cascade has been developed to afford a complex and highly strained [4-5-6-7] tetracyclic framework in good yields and excellent diastereoselectivities. During this transformation, three rings, three C-C bonds, and four contiguous stereocenters were formed efficiently. Mechanistically, the rare sterically congested multisubstituted cyclobutanes are constructed readily through Michael addition and a Mannich reaction cascade.
RESUMO
A Cu(acac)2-catalyzed cyclization reaction of 2-cyanobenzaldehydes with 2-isocyanoacetates has been successfully developed providing an efficient strategy for the synthesis of substituted 1-aminoisoquinolines. The reaction proceeds smoothly under mild conditions with high efficiency, and might provide an alternative strategy for the synthesis of 1-aminoisoquinoline containing molecules.
RESUMO
An Au(i)-catalyzed cyclization/1,2-rearrangement/aromatization cascade of 3-yne-1,2-diols has been successfully realized. This reaction not only provides a new and efficient strategy for the synthesis of substituted cycloalka[b]furan compounds as well as their derivatives, but might also facilitate related biological studies.
RESUMO
A Zn(OTf)2-promoted cyclization reaction of tosylhydrazones with 2-(dimethylamino)malononitrile has been successfully developed providing an efficient strategy for the synthesis of substituted 1-tosyl-1H-pyrazoles.
RESUMO
An unprecedented nucleophilic addition/cyclization/aromatization cascade of basic chemicals, i.e., aromatic alkenes/alkynes, trimethylsilyl cyanide and N,N-disubstituted formamide, has been developed to give a series of multisubstituted pyrroles in moderate to good yields with high regioselectivities. This reaction not only reveals a new reaction mode for α-aminonitriles, but also provides a new and efficient cyclization pattern for the synthesis of multisubstituted pyrroles as well as their derivatives, which might facilitate related biological studies.
