Rapid synthesis of acid azides via in situ generation of acid chlorides using CPICl as chlorinating agent from the corresponding Nα-protected amino acids is described. Also the conversion of acid azides into ureidopeptides through the Curtius rearrangement under ultrasonication is delineated. The mildness of the protocol renders the acid-sensitive substrates to afford the corresponding amino acid azides
direct precursors of 1,3,5-triazepan-2,6-diones, a novel class of conformationallyconstrained dipeptide mimetics. Herein, we have evaluated the use of these building blocks for the synthesis of ureido-peptides (in solution and on solid support), peptidyl hydantoins, oligoureas and some oligo(urea/amide) hybrids. Conformational investigations by NMR of ureidotripeptide 6i and pentamer 10, consisting of alternating
Synthesis of Acyl Phosphoramidates Employing a Modified Staudinger Reaction
作者:Iain Currie、Brad E. Sleebs
DOI:10.1021/acs.orglett.0c03987
日期:2021.1.15
A one-step synthesis of acyl phosphoramidates from a variety of functionalized acyl azides has been developed employing trimethylsilyl chloride as an activating agent in a modified Staudinger reaction. The methodology was further adapted to include the in situ generation of the acyl azides from a diverse selection of carboxylic acids and hydrazide startingsynthons. The reaction scope was extended
Synthesis of <i>N</i> <sup> <font>α</font> </sup>-Protected Amino Acid–Derived Selenocarbamates Employing Isocyanates as Key Intermediates
作者:Vommina V. Sureshbabu、Shankar A. Naik
DOI:10.1080/00397910903318641
日期:2010.8.16
A simple protocol for the synthesis of N-urethane-protected N-alkyl-Se-alkyl selenocarbamate derivatives of amino acids has been described. The reaction of N-urethane-protected amino alkyl isocyanates with selenating agent LiAlHSeH and subsequent coupling with an alkyl halide yielded the title compounds in good yield and purity. All the selenocarbamates obtained have been characterized by 1H NMR, 13C NMR, and mass spectral studies.
Efficient Synthesis of <i>O</i>-Succinimidyl-(<i>tert</i>-Butoxycarbonylamino)methyl Carbamates Derived from α-Amino Acids Accelerated by Ultrasound: Application to the Synthesis of Ureidodipeptides
作者:Vommina V. Sureshbabu、Naremaddepalli S. Sudarshan、Kantharaju
DOI:10.1080/00397910802026386
日期:2008.6.20
The synthesis of O-succinimidyl-(tert-butoxycarbonylamino)methyl carbamates employing isocyanates made through the Curtius rearrangement of Boc-amino acid azides in the presence of N-hydroxysuccinimide under the influence of ultrasound is described.