Stereoselective Three-Carbon and Two-Carbon Elongation of the Carbon Chain in N-Boc-Protected α-Aminoacylsilanes: An Entry to Functionalized β-Amino Alcohols and to Statine Analogues
[EN] PROCESS FOR ENANTIOSELECTIVE PREPARATION OF NITROKETONE, AN INTERMEDIATE OF PROTEASE INHIBITORS [FR] PROCÉDÉ D'ÉLABORATION ÉNANTIOSÉLECTIVE DE LA NITROCÉTONE QUI EST UN INTERMÉDIAIRE DES INHIBITEURS DES PROTÉASES
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.
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
A Convenient Conversion of <i>α</i>-Aminoacids into NH-Boc Protected <i>α</i>-Aminoketones <i>via</i> Imidazolides
作者:Bianca F. Bonini、Mauro Comes-Franchini、Mariafrancesca Fochi、Germana Mazzanti、Alfredo Ricci、Greta Varchi
DOI:10.1055/s-1998-1831
日期:1998.9
Imidazolides obtained from natural α-aminoacids react with a twofold excess of Grignard reagents to afford in satisfactory to good yields the corresponding NH-Boc protected α-aminoketones. Under optimized conditions the reaction with phenyl- and n-pentylmagnesium bromide required the addition of catalytic amounts of Cu(I)-salt which turned out to be unnecessary in the case of Buchi's Grignard.
作者:Zahraa S. Al-Taie、Joseph M. Anderson、Laura Bischoff、Jeppe Christensen、Simon J. Coles、Richard Froom、Mari E. Gibbard、Leigh F. Jones、Frank F.J. de Kleijne、Patrick J. Murphy、Emma C. Thompson
DOI:10.1016/j.tet.2021.132093
日期:2021.6
We report the preparation of a range of N-protected amino acidderived guanidine organocatalysts and their application to the Michael addition of 2-hydroxy-1,4-napthoquinone to β-nitrostyrene, achieving a maximum ee of 26%. Whilst these catalysts gave poor ees, the structural variation together with the X-ray crystallographic study of the intra- and intermolecular hydrogen bonding reported suggest
我们报告了一系列N-保护氨基酸衍生的胍有机催化剂的制备及其在 2-羟基-1,4-萘醌与 β-硝基苯乙烯的迈克尔加成中的应用,实现了 26% 的最大 ee。虽然这些催化剂的 ees 较差,但结构变化以及分子内和分子间氢键的 X 射线晶体学研究表明,C 2对称催化剂是该方法进一步发展的先导化合物。
Combined Photoredox and Carbene Catalysis for the Synthesis of Ketones from Carboxylic Acids**
作者:Anna V. Bay、Keegan P. Fitzpatrick、Rick C. Betori、Karl A. Scheidt
DOI:10.1002/anie.202001824
日期:2020.6.2
development of a novel single-electron reduction of acyl azoliums for the formation of ketones from carboxylic acids. Facile construction of the acyl azolium in situ followed by a radical-radical coupling was made possible merging N-heterocyclic carbene (NHC) and photoredox catalysis. The utility of this protocol in synthesis was showcased in the late-stage functionalization of a variety of pharmaceutical compounds