Hexafluoraceton als Schutzgruppen-und Aktivierungsreagenz in der Aminosäure-und Peptidchemie, 11. Mitt.: Ein neuer präparativ einfacher Zugang zu 2,5-Dioxopiperazinen und 2,5-Dioxomorpholinen
摘要:
2,5-Dioxopiperazines with symmetrical as well as unsymmetrical substituent pattern can be obtained via 2,2-bis(trifluoromethyl)-1,3-oxazolidin-5-ones, and 2,5-dioxomorpholines via 2,2-bis-(trifluoromethyl)-1,3-dioxolan-4-ones, respectively.
O-Glycosylated hexafluoroacetone-protected amino acid derivatives have been synthesized starting from serine, threonine, 4-hydroxyproline and tyrosine. They represent a new class of building blocks suitable for a divergent approach to O-glycopeptides.
In only three or four steps glycosylated dipeptide and tripeptide fragments, respectively (see scheme), can be obtained from hydroxy amino acids by using a novel protecting group/activation concept. The method presented is even superior to the pentafluorophenyl ester method.
作者:Radics, Gabor、Schedel, Hartmut、Heistracher, Elisabeth、Sieler, Joachim、Hennig, Lothar、Burger, Klaus
DOI:——
日期:——
Hexafluoraceton als Schutzgruppen-und Aktivierungsreagenz in der Aminosäure-und Peptidchemie, 11. Mitt.: Ein neuer präparativ einfacher Zugang zu 2,5-Dioxopiperazinen und 2,5-Dioxomorpholinen
2,5-Dioxopiperazines with symmetrical as well as unsymmetrical substituent pattern can be obtained via 2,2-bis(trifluoromethyl)-1,3-oxazolidin-5-ones, and 2,5-dioxomorpholines via 2,2-bis-(trifluoromethyl)-1,3-dioxolan-4-ones, respectively.