A new and general method for the synthesis of tripeptide aldehydes based on the multi-component Ugi reaction
作者:Michał Mroczkiewicz、Ryszard Ostaszewski
DOI:10.1016/j.tet.2009.03.018
日期:2009.5
Tripeptide aldehydes, such as Z-Leu-Leu-Leu-H (MG-132), are an important class of compounds due to their biological activity. A new, generalmethod for the synthesis of tripeptide aldehydes based on the multi-component Ugi reaction was developed. A careful choice of isocyanides makes it possible to obtain tripeptide precursors whose functionalization led to target structures. This method can be used
Construction of combinatorial chemical libraries using a rapid and efficient solid phase synthesis based on a multicomponent condensation reaction
作者:Sang Woong Kim、Shawn M. Bauer、Robert W. Armstrong
DOI:10.1016/s0040-4039(98)01547-0
日期:1998.9
A 96 member library of acylated dipeptides based on a known anticonvulsant was synthesized utilizing an Ugi four component condensation followed by derivitization through nucleophilic displacement of a Weinreb type amide. The library afforded compounds in reasonable yield and high purity after cleavage from solid support.
Mono Alkylation of α-Isocyano Acetamide to its Higher Homologues
作者:Jieping Zhu、Christopher Housseman
DOI:10.1055/s-2006-944224
日期:2006.7
Alkylation of α-isocyano acetamide (2) with alkyl halide in MeCN at 0 °C in the presence of cesium hydroxide afforded the mono-alkylated product 1 in good to excellent yield.
0 °C 时,在氢氧化铯存在下,在 MeCN 中用烷基卤化物对 δ- 异氰基乙酰胺(2)进行烷基化反应,得到了单烷基化产物 1,收率从良好到极好。
Synthesis of <i>cis</i>-Octahydroindoles via Intramolecular 1,3-Dipolar Cycloaddition of 2-Acyl-5-aminooxazolium Salts
作者:Corey H. Basch、Jameson A. Brinck、Joaquin E. Ramos、Stephen A. Habay、Glenn P.A. Yap
DOI:10.1021/jo301600p
日期:2012.11.16
products contain 2-amido and 7-hydroxyl substituents. A series of 2-acyl-5-aminooxazoles were prepared in one step. Upon methylation of the oxazole nitrogen atom, the substrates underwent rapid intramolecular 1,3-dipolar cycloaddition with a tethered alkene and, after reduction with excess hydride, produced octahydroindoles with excellent diastereoselectivity. The method allows for the installation
Silver‐Catalyzed Asymmetric Aldol Reaction of Isocyanoacetic Acid Derivatives Enabled by Cooperative Participation of Classical and Nonclassical Hydrogen Bonds
The silver-catalyzed asymmetric aldol reaction of isocyanoacetic acid derivatives with aldehydes has been developed by employing a chiral prolinol-phosphine as a hydrogen-bond-donating P,N,O ligand. DFT calculations indicated that the reaction proceeds in a stepwise manner, involving C−C bond forming carbonyl addition and subsequent enantioselectivity-determining oxazoline ring formation. An O−H⋅⋅⋅O/sp3-C−H⋅⋅⋅O