Carbonyldiimidazole (CDI) Mediated Synthesis of Nα-Protected Amino Acid Azides: Application to the One-pot Preparation of Ureidopeptides
作者:B. Vasantha、T. M. Vishwanatha、Vommina V. Sureshbabu
DOI:10.2174/092986611797200922
日期:2011.11.1
Synthesis of Nα-protectedamino acyl azides starting from corresponding acids via the carbonyldiimidazole (CDI) activation is described. The protocol is extended for a one-pot preparation of ureido peptides that circumvents the isolation of acyl azide and isocyanate intermediates. The reaction was accomplished without using any additives and base. The protocol is simple, clean, high yielding and free
N-Protected α-amino acids can be easily converted directly into chiral α-amino aldehydes in a one-pot procedure by activation with CDI followed by reduction with DIBAL-H.
Cu(I)-catalyzed [3+2] Cycloadditions of tert-Butyl (S)-(3-Oxopent-4- yn-2-yl)carbamate to 1-Benzylidenepyrazole-3-one-derived Azomethine Imines
作者:Eva Pušavec、Jona Mirnik、Luka Šenica、Uroš Grošelj、Branko Stanovnik、Jurij Svete
DOI:10.5560/znb.2014-4011
日期:2014.5.1
Parallel screening of suitable reaction conditions for Cu(I)-catalyzed [3+2] cycloadditions of (1Z,4R*,5R*)-4-benzoylamino-1-benzylidene-5-phenyl-3-oxopyrazolidin-1-ium-2-ide (1a) to methyl propiolate (2) has established that this reaction proceeds smoothly at room temperature in acetonitrile in the presence of CuI and Hünig’s base. The optimized reaction conditions were then applied in regio- and stereo-selective
Synthesis and preliminary biological evaluations of (+)-isocampholenic acid-derived amides
作者:Uroš Grošelj、Amalija Golobič、Damijan Knez、Martina Hrast、Stanislav Gobec、Sebastijan Ričko、Jurij Svete
DOI:10.1007/s11030-016-9668-9
日期:2016.8
The synthesis of two novel (+)-isocampholenic acid-derived amines has been realized starting from commercially available (1S)-(+)-10-camphorsulfonic acid. The novel amines as well as (+)-isocampholenic acid have been used as building blocks in the construction of a library of amides using various aliphatic, aromatic, and amino acid-derived coupling partners using BPC and CDI as activating agents. Amide
Chirality transfer in the aza-[2,3]-Wittig sigmatropic rearrangement
作者:James C. Anderson、J. Gair Ford、Matthew Whiting
DOI:10.1039/b510756c
日期:——
The aza-[2,3]-Wittig sigmatropicrearrangements of substrates derived from enantiomerically pure alanine, valine and serine with phenyl and ester anion stabilising groups were investigated for their efficiency in chirality transfer. It was found that a methyl substituent at the stereogenic centre of the rearrangement precursors was inadequate to control the alkene stereoselectivity and enantioselectivity