Morita–Baylis–Hillman adducts as effective dipolarophiles in Copper(<scp>i</scp>)-catalyzed 1,3-dipolar cycloaddition with azomethine ylides: asymmetric construction of pyrrolidine derivatives containing quaternary stereogenic center
作者:Huai-Long Teng、He Huang、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c1cc11138h
日期:——
The first catalyticasymmetric1,3-dipolarcycloaddition of azomethineylides with easily accessible Morita-Baylis-Hillman adducts as the dipolarophiles has been developed successfully and provides the highly substituted pyrrolidines bearing a unique quaternary and two tertiary stereogenic centers in excellent diastereoselectivity and up to 97% ee.
[reaction: see text] Silver fluoride and cinchonaalkaloidscatalyze the diastereo- and enantioselective 1,3-dipolar cycloaddition between azomethine ylides, generated from N-alkylideneglycine esters, and acrylates to give the corresponding endo-adducts. Azomethine ylides derivedfrom aromatic and aliphatic aldehydes react in a highly diastereoselective reaction with good yields and enantioselectivities
Catalytic Asymmetric [3+2] Cycloaddition of Azomethine Ylides. Development of a Versatile Stepwise, Three-Component Reaction for Diversity-Oriented Synthesis
作者:Chuo Chen、Xiaodong Li、Stuart L. Schreiber
DOI:10.1021/ja036558z
日期:2003.8.1
We report a new catalyst system that should enhance the use of enantioselective 1,3-dipolar cycloadditions of azomethine ylides with electronic-deficient olefins in the divergent pathways of diversity-oriented synthesis (DOS). The underlying reaction is of considerable interest in DOS because its stereospecificity enables stereochemical diversification of up to four tetrahedral centers on pyrrolidine
我们报告了一种新的催化剂系统,该系统应该在多样性导向合成 (DOS) 的不同途径中增强对偶氮甲碱叶立德与缺电子烯烃的对映选择性 1,3-偶极环加成的使用。潜在的反应在 DOS 中引起了相当大的兴趣,因为它的立体定向性使吡咯烷环上多达四个四面体中心的立体化学多样化成为可能。这种新的催化剂系统扩展了偶氮甲碱叶立德环加成反应的范围和选择性,并且与用于 DOS 的单珠/单储备溶液技术平台中使用的试剂兼容。
Biology-oriented synthesis of benzopyrano[3,4-c]pyrrolidines
作者:Marco Potowski、Christopher Golz、Carsten Strohmann、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1016/j.bmc.2015.02.044
日期:2015.6
A natural product inspired synthesis of 6,6,5-tricyclic compounds via a silver(I)-catalyzed formal 1,3-dipolar cycloaddition of coumarins with α-iminoesters was developed. The reaction proceeds in a stepwise reaction course under formation of the trans-substituted diastereomer with respect to the 1,3-dipole and shows a broad substrate scope.
Enantioselective synthesis of 4-aminopyrrolidine-2,4-dicarboxylate derivatives via Ag-catalyzed cycloaddition of azomethine ylides with alkylidene azlactones
作者:María González-Esguevillas、Javier Adrio、Juan C. Carretero
DOI:10.1039/c3cc41663a
日期:——
A catalytic highly enantioselective silver–DTBM-segphos catalyzed cycloaddition of α-iminoesters with alkylidene azlactones is reported. This procedure provides an effective access to 4-aminopyrrolidine-2,4-dicarboxylate derivatives with high diastereo- and enantioselectivity.