Chemical transformations of diazoles in the reactions of carboxylation, N-siloxycarbonylation, and transsilylation
摘要:
The behavior of 3,5-dimethylpyrazole, 3(5)-methylpyrazole, imidazole and their trimethyl-silyl derivatives in carboxylation, N-siloxycarbonylation, and transsilylation reactions was studied. A new Nsiloxycarbonylation reagent, diazole trimethylsilyl derivative-carbon dioxide, was found. This reagent makes it possible to obtain easily O-silylurethanes starting from primary, secondary amines and hydrazine derivatives, as well as to develop a convenient one pot synthesis method for trimethylsiloxycarbonyldiazoles.
Various imidazolylsilane derivatives were synthesized by a trans-silylation procedure between l-(trimethylsilyl)imidazoles and chlorosilanes. Among them, tris- and tetrakis(imidazol-1-yl)silane compounds reacted smoothly with free carboxylic acids to form the corresponding 1-acylimidazoles, which subsequently underwent condensation with amines to afford carboxamides in good to high yields. These results
Indol-1-yl- und pyrrol-1-yl-substituierte verbindungen des siliciums und phosphors
作者:A Frenzel、M Gluth、R Herbst-Irmer、U Klingebiel
DOI:10.1016/0022-328x(95)06039-y
日期:1996.5
Trichlorosilanes react with lithium indolide under formation of the mono- and bis(indol-1-yl)silanes C8H6NR (R CMe3 (1), Ph (2)) and (C8H6N)2SiClPh (3). In the reaction of lithium pyrrolide (4) and 2 the mono- and bis(pyrrol-1-yl)silanes C8H6NSiC(Ph)C4H4N (5) and C8H6NSi(Ph)(C4H4N)2 (6) are obtained. The bis(imidazol-1-yl)dimethylsilane 7 is formed in the reaction of the sodium derivative of
Synthesis of Silacyclic Dipeptides: Peptide Elongation at Both N- and C-Termini of Dipeptide
作者:Tomohiro Hattori、Hisashi Yamamoto
DOI:10.1021/jacs.1c11260
日期:2022.2.2
A new type of peptide bond formation utilizing silacyclic aminoacids or peptides is described. This work has the following advantages: (1) imidazolylsilane is a highly fascinating coupling reagent for dipeptide synthesis from N-,C-terminal unprotected aminoacids with aminoacid tert-butyl esters; (2) deprotection of the tert-butyl ester at the C-terminus and cyclization sequentially proceed depending
Chemical transformations of diazoles in the reactions of carboxylation, N-siloxycarbonylation, and transsilylation
作者:L. O. Belova、M. V. Pletnev、A. D. Kirilin
DOI:10.1134/s1070363213070116
日期:2013.7
The behavior of 3,5-dimethylpyrazole, 3(5)-methylpyrazole, imidazole and their trimethyl-silyl derivatives in carboxylation, N-siloxycarbonylation, and transsilylation reactions was studied. A new Nsiloxycarbonylation reagent, diazole trimethylsilyl derivative-carbon dioxide, was found. This reagent makes it possible to obtain easily O-silylurethanes starting from primary, secondary amines and hydrazine derivatives, as well as to develop a convenient one pot synthesis method for trimethylsiloxycarbonyldiazoles.