Efficient construction of highly functionalized spiro[γ-butyrolactone-pyrrolidin-3,3′-oxindole] tricyclic skeletons via an organocatalytic 1,3-dipolar cycloaddition
作者:Long Wang、Xiao-Mei Shi、Wei-Ping Dong、Li-Ping Zhu、Rui Wang
DOI:10.1039/c3cc40669e
日期:——
Highly functionalized spiro[gamma-butyrolactone-pyrrolidin-3,3'-oxindole] tricyclic skeletons were delivered successfully with high optical purity using an effective yet simple procedure.
with cyclic imino esters catalyzed by a bifunctional chiral tertiary amine has been developed, which provides an efficient access to optically active β-position functionalized pyrrolidin-2-one derivatives in both high yield and enantioselectivity (up to 78% yield and 95 : 5 er). This is the first catalytic method to access chiral β-functionalized pyrrolidin-2-one via a direct organocatalytic approach
Here, we report a convenient access to diastereoselectivesynthesis of polysubstituted pyrrolidines bearing a unique spiro quaternary center at the C-2 position and another quaternary center at C-4. The synthesis system, CuII/P, N-Ligand-catalyzed 1, 3-dipolar cycloaddition, by employing homoserine lactone derived cyclic imino esters as the dipoles and α, α, β-trisubstituted olefins as the dipolarophlies
在这里,我们报告了一个方便的方法,可方便地进行多取代的吡咯烷的非对映选择性合成,该取代基在C-2位置带有一个独特的螺旋季中心,在C-4位置具有另一个季中心。通过使用高丝氨酸内酯衍生的环状亚氨基酯作为偶极,以α,α,β-三取代烯烃为偶极子,Cu II / P,N-配体催化的1,3-偶极环加成反应的合成系统提供了exo -spiro-吡咯烷类具有良好的收率,高的非对映选择性(高达> 98:2 dr),并且在广泛的底物上表现良好。
exo-Selective construction of spiro-[butyrolactone-pyrrolidine] via 1,3-dipolar cycloaddition of azomethine ylides with α-methylene-γ-butyrolactone catalyzed by Cu(i)/DTBM-BIPHEP
作者:Qing-Hua Li、Tang-Lin Liu、Liang Wei、Xiang Zhou、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c3cc45493b
日期:——
An expedient access to optically active spiro-[butyrolactone-pyrrolidine] was successfully developed via an unprecedented Cu(I)-catalyzed exo-selective 1,3-DC of azomethine ylides with α-methylene-γ-butyrolactone, which exhibited high diastereoselectivity (>98â:â2), excellent enantioselectivity (96â>99% ee) and a broad substrate scope under mild conditions.
Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Two Different Ylides: Facile Access to Chiral 1,2,4-Triazinane Frameworks
作者:Min-Chao Tong、Xuan Chen、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1002/anie.201306300
日期:2013.11.18
Ylides at a crossing: An unprecedented 1,3‐dipolar cycloaddition (cross‐cycloaddition) between twodifferentylides (see scheme) was realized by using the chiral CuI/tBu‐Phosferrox complex as the catalyst under mild reaction conditions. This catalytic system provides an expeditious approach to the construction of highly functionalized 1,2,4‐triazinane derivatives in good yields with excellent diastereoselectivities
交叉点处的耶利德:在温和的反应条件下,通过使用手性Cu I / t Bu-Phosferrox配合物作为催化剂,实现了两个不同的耶利德之间前所未有的1,3-偶极环加成(交叉环加成)(参见方案)。该催化体系为构建高官能度的1,2,4-三氮杂烷衍生物提供了一种快速的方法,该衍生物具有良好的收率和出色的非对映选择性和对映选择性。