The first asymmetric total synthesis of (−)‐ligustiphenol is reported. The key step was conducted by exploiting a steric hindrance effect to control the formation of the adduct in a nucleophilic α‐Li‐phenolate addition reaction to the intermediate α‐oxo (−)‐menthyl ester. The synthesis is concise and feasible for the construction of analogous compounds and investigation of their biological activity
Utilisation des alcoxytrialkylaluminates en synthese asymetrique: Synthese de l'acide hydroxy-2, methyl-2 butanoique enantiomeriquement enrichi en R ou S
作者:D. Vegh、G. Boireau、E. Henry-Basch
DOI:10.1016/0022-328x(84)80167-9
日期:1984.5
The reaction of LiAlEt3OR★ with (−)-menthyl pyruvate (R★OH = (−)-N-methylephedrine) and with (+)-menthyl pyruvate (R★OH = (+)-N-methylephedrine) in hexane/ether as solvent produces the corresponding 2-hydroxy-2-methylbutanoic acids enriched in S- or R-enantiomers, respectively, with an enantiomeric excess close to 60%.
The Synthesis of Dehydroamino Acids from Pyruvic Acid
作者:David T. Davies、Karen Goodall、Neha Kapur、Matthew O'Brien、Andrew F. Parsons
DOI:10.1080/00397919708007306
日期:1997.11
Abstract Dehydroaminoacids can be prepared in a one-pot reaction from pyruvates in 47-74% yield.
摘要 脱氢氨基酸可以通过丙酮酸的一锅反应以 47-74% 的产率制备。
Synthesis of α-Hydroxyl and α-Amino Pyridinyl Esters via Photoreductive Dual Radical Cross-Coupling
作者:Xian-Chao Cui、Hu Zhang、Hao Zhang、Yi-Ping Wang、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.3c02780
日期:2023.10.6
A method for the synthesis of α-hydroxyl and α-amino pyridinyl esters via photoreductive dual radical cross-coupling catalyzed by the super-organoreductant CBZ6 has been developed. A wide range of 2-pyridinylation and 4-pyridinylation of either α-ketoesters or imine derivatives has been achieved. The applications in the synthesis of pyridinyl amino-hydroxyl acids as well as a new chiral oxazoline ligand