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。
Stereoselective 1,3-Dipolar Cycloaddition of a Maleate Derivative with Azomethine Ylides Derived from α-Amino Esters: Synthesis of 3-Pyrrolines
[3+2] cycloadditions of N-metalated azomethine ylidesderivedfrom α-amino esters with a dimethyl 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate derivative, followed by retro-Diels-Alder reactions. This two-step sequence appears superior to the direct reaction of ylides with dimethyl acetylenedicarboxylate and should be applicable to solid-phase synthesis.
Stereocontrolled Pericyclic and Radical Cycloaddition Reactions of Readily Accessible Chiral Alkenyl Diazaborolidines
作者:Mingkai Zhang、Peilin Xu、Alex J. Vendola、Christophe Allais、Anne‐Marie Dechert Schmitt、Robert A. Singer、James P. Morken
DOI:10.1002/anie.202205454
日期:2022.7.25
Chiral diazaborolidines that are easily prepared, inexpensive, stable, and provide excellent stereoselection across a number of reaction classes are described. These versatile compounds can be used in four different classes of cycloadditionreactions, offering good yield and stereoselectivity.
Synthesis of Peptidomimetics Containing a β-Lactam Moiety Using Peptidic Diazoketones and Imines in a Staudinger Reaction
作者:Michael R. Linder、Joachim Podlech
DOI:10.1021/ol9908171
日期:1999.9.1
[GRAPHICS]Rearrangement of alpha-amino acid or oligopeptide derived diazoketones in the presence of N-benzylbenzaldimine, alpha- amino acid, or tripeptide derived imines, respectively, led to peptidyl-substituted beta-lactams. The trans-substituted diastereoisomers are formed exclusively.
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