paper describes a multicomponent approach to novel totally protected precursors of PNA-monomers viaUgi 4CC. The obtained bisamides are converted into several partially protected PNA-monomers or derivatives thereof using three different procedures. Methods for hydrolysis are shown to be dependent on the nature of the isocyano component required for Ugi 4CC. Several novel monomers suitable for oligomer
Synthesis of Isonitriles from N-Substituted Formamides Using Triphenylphosphine and Iodine
作者:Qun-Li Luo、Xia Wang、Qing-Gang Wang
DOI:10.1055/s-0034-1379111
日期:——
alkyl and aryl isocyanides. Treatment of N-substituted formamides with the reagent combination of triphenylphosphine and molecular iodine, in the presence of a tertiary amine, quickly produces the corresponding isocyanides in high yields under ambient conditions. The process employs readily available and low-cost reagents, a convenient synthetic procedure, and mild reaction conditions for the synthesis
AbstractA concise route for the synthesis of the novel compound class tetrazole–diketopiperazines was developed. The approach involves the use of two multicomponent reactions: the Ugi tetrazole four‐component reaction (4CR) and the classical intramolecular Ugi 4CR. The tetrazole–diketopiperazines comprise analogs of and are bioisosteric to bioactive diketopiperazines, which thus draws attention for novel bioactive compound design. This scaffold was produced to fill the screening deck of the European lead factory.
Versatile Protecting-Group Free Tetrazolomethane Amine Synthesis by Ugi Reaction
作者:Pravin Patil、Michel de Haan、Katarzyna Kurpiewska、Justyna Kalinowska-Tłuścik、Alexander Dömling
DOI:10.1021/acscombsci.5b00189
日期:2016.3.14
components. The scope and limitations of this reaction and a structure–reactivity relationship are provided by performing >85 reactions. The primary amine component of the α-amino tetrazole is a versatile starting material for further reactions.