Photochemical alkylation of glycine leading to phenylalanines
作者:Haydn S Knowles、Keith Hunt、Andrew F Parsons
DOI:10.1016/s0040-4039(00)01175-8
日期:2000.9
UV photolysis of protected glycines in the presence of di-tert-butyl peroxide, benzophenone and substituted toluenes is shown to lead to selective alkylation at the α-position. Phenylalanines are isolated in yields of generally >50% (based on recovered starting material).
Stereoselective Synthesis of 1,3-Diaminotruxillic Acid Derivatives: An Advantageous Combination of CH-<i>ortho</i>
-Palladation and On-Flow [2+2]-Photocycloaddition in Microreactors
作者:Elena Serrano、Alberto Juan、Angel García-Montero、Tatiana Soler、Francisco Jiménez-Márquez、Carlos Cativiela、M. Victoria Gomez、Esteban P. Urriolabeitia
DOI:10.1002/chem.201503742
日期:2016.1.4
The stereoselective synthesis of ε‐isomers of dimethyl esters of 1,3‐diaminotruxillic acid in three steps is reported. The first step is the ortho‐palladation of (Z)‐2‐aryl‐4‐aryliden‐5(4H)‐oxazolones 1 to give dinuclear complexes 2 with bridging carboxylates. The reaction occurs through regioselective activation of the ortho‐CH bond of the 4‐arylidene ring in carboxylic acids. The second step is
A photochemical approach to phenylalanines and related compounds by alkylation of glycine
作者:Haydn S Knowles、Keith Hunt、Andrew F Parsons
DOI:10.1016/s0040-4020(01)00783-9
日期:2001.9
Phenylalanines can be prepared on UV photolysis of protected glycines in the presence of di-tert-butylperoxide, substituted toluenes and the photosensitiser benzophenone. These reactions, which lead to highly selective mono-alkylation at the α-position of glycines, involve coupling of captodative α-glycine radicals with benzyl radicals. This method can be used to selectively alkylate a variety of