One-Pot Syntheses of Dissymmetric Diamides Based on the Chemistry of Cyclic Monothioanhydrides. Scope and Limitations and Application to the Synthesis of Glycodipeptides
作者:David Crich、Kaname Sasaki、Md Yeajur Rahaman、Albert A. Bowers
DOI:10.1021/jo900532e
日期:2009.5.15
protection of alcohols in the various reaction components. Reaction of N-benzyloxycarbonyl-l-aspartic monothioanhydride with unprotectedglycosyl amines, followed by capture of the thioacid intermediate with N-sulfonyl aminoacid derivatives results in a three-component convergent synthesis of glycosylated peptides.
Cyclic Thioanhydrides: Linchpins for Multicomponent Coupling Reactions Based on the Reaction of Thioacids with Electron-Deficient Sulfonamides and Azides
作者:David Crich、Albert A. Bowers
DOI:10.1021/ol702570x
日期:2007.12.1
electron-deficient azides or, preferably, 2,4-dinitrobenzenesulfonamides. In this manner the cyclic thioanhydride serves as a linchpin in a three-componentcouplingsequence. The use of thiomaleic anhydride and a bifunctional nucleophile extends the process to heterocycle synthesis, while a cyclic thioanhydride prepared from aspartic acid directly provides N-functionalized asparagine derivatives.