Alkenyl Arenes as Dipolarophiles in Catalytic Asymmetric 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides
作者:Ana Pascual-Escudero、Abel de Cózar、Fernando P. Cossío、Javier Adrio、Juan C. Carretero
DOI:10.1002/anie.201609187
日期:2016.12.5
The use of alkenyl arenes as dipolarophiles in the catalytic asymmetric 1,3‐dipolarcycloaddition of azomethineylides is reported. Under appropriate reaction conditions with a CuI or AgI catalyst either the exo or the endo adduct was obtained with high stereoselectivity. This process provides efficient access to highly enantiomerically enriched 4‐aryl proline derivatives. The observed results are
Direct synthesis of pyrroles via 1,3-dipolar cycloaddition of azomethine ylides with ynones
作者:Zheng Wang、Ying Shi、Xiaoyan Luo、De-Man Han、Wei-Ping Deng
DOI:10.1039/c3nj00067b
日期:——
A direct and facile synthesis of multi-substituted pyrroles via AgOAc-catalyzed 1,3-dipolarcycloaddition of azomethine ylides with ynones is developed, providing the corresponding adducts in moderate to high yields (up to 89%).
In this work, we introduced a multifunctional Ag(I)/CAAA-amidphos complex catalyzed asymmetric 1,3-dipolarcycloaddition of acrylates with α-imino esters, affording a series of 2,4,5-trisubstituted endo-pyrrolidines in good yields (up to 97%) with high enantioselectivities (up to 98% ee). Meanwhile, the catalytic system was also applied in the three-component one-pot reaction of α-imino esters formed
The l -tert-leucine-derived AmidPhos/silver(I) catalytic system has been developed for the asymmetric [3+2] cycloaddition of azomethineylides with electronic-deficient alkenes with or without Et3N. Under optimal conditions, highly functionalized endo-4-pyrrolidines were obtained with modest to high yields (up to 99% yield) and enantioselectivities (up to 98% ee).
Catalytic asymmetric 1,3-dipolar cycloaddition of N-unprotected 2-oxoindolin-3-ylidene derivatives and azomethine ylides for the construction of spirooxindole-pyrrolidines
作者:Tang-Lin Liu、Zhi-Yong Xue、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c0ob00943a
日期:——
Asymmetric 1,3-dipolar cycloaddition of N-unprotected 2-oxoindolin-3-ylidene with azomethine ylides for the construction of spirooxindole-pyrrolidines bearing four contiguous stereogenic centers has been achieved with AgOAc/TF-BiphamPhos complexes for the first time. This catalytic system performance well over a broad scope of substrates, providing the synthetically useful adducts in high yields and excellent diastereoselectivities and moderate enantioselectivities.