Highly functionalised organolithium and organoboron reagents for the preparation of enantiomerically pure α-amino acids
作者:Christopher W. Barfoot、Joanne E. Harvey、Martin N. Kenworthy、John Paul Kilburn、Mahmood Ahmed、Richard J.K. Taylor
DOI:10.1016/j.tet.2004.10.097
日期:2005.3
organolithium reagents derived from l-serine have been generated and reacted with electrophiles. The novel enantiomericallypure adducts thus obtained were then converted, through β-amino alcohols, into novel non-proteinogenic α-aminoacids. The methodology also made available a novel boronic acid which was then employed as a Suzuki cross-coupling partner, elaborating a new pathway to phenylalanine analogues
Synthesis of Unnatural α‐Amino Acid Derivatives via Light‐Mediated Radical Decarboxylative Processes
作者:Kay Merkens、Francisco José Aguilar Troyano、Jonas Djossou、Adrián Gómez‐Suárez
DOI:10.1002/adsc.202000300
日期:2020.6.15
Unnatural amino acids (UAAs) are key building blocks with widespread application across several scientific fields. Therefore, it is highly attractive to develop straightforward and simple methodologies capable of granting quick access to these species. Herein we report a light‐mediated protocol for the synthesis of UAA via radical decarboxylative processes. This methodology, which employs readily available
Synthesis of novel chiral oxazoline ligands and application in the highly enantioselective diethylzinc addition to N-diphenylphosphinoylimines
作者:Gexin Yan、Yong Wu、Wenqing Lin、Xiaomei Zhang
DOI:10.1016/j.tetasy.2007.10.035
日期:2007.11
Two sets of novel chiraloxazoline ligands were designed and conveniently prepared from readily available l-aspartic acid and evaluated in enantioselective diethylzincaddition to N-diphenylphosphinoyl imines. In the presence of stoichiometric amounts of these ligands, high enantioselectivities (up to 95% ee) and yields (up to 85%) were achieved for several aromatic imines in toluene at room temperature
Highly Functionalized Organolithium Reagents for Enantiomerically Pure α-Amino Acid Synthesis
作者:Martin N. Kenworthy、John Paul Kilburn、Richard J. K. Taylor
DOI:10.1021/ol0360039
日期:2004.1.1
Highly functionalized L-serine-derived organolithium reagents have been generated and reacted with a variety of electrophiles, delivering novel enantiomerically pure adducts. These adducts were then converted into homochiral amino alcohols and novel nonproteinogenic alpha-amino acids, including an aspartic acid mimic that has been synthesized in an enantiomerically pure form for the first time.