Diethoxyphosphoryl as a Protecting-Activating Group in the Synthesis of Polyazacyclophanes
摘要:
The fully diethoxyphosphoryl(Dep)-protected polyamines 1b-3b were prepared from the corresponding polyamines with 'diethyl phosphite' (= diethyl phosphonate) and CCl4 in a solid base/organic liquid two-phase system in the presence of Bu4NBr as phase-transfer catalyst. Subsequent phase-transfer-catalyzed alkylation of phosphoramidates 1b-3b with bis(chloromethyl)arenes 5-8 in the presence of Bu4N(HSO4) followed by deprotection gave good yields of polyazacyclophanes 9a-16a.
Synthesis of selectively protected polyaza macrocycles
摘要:
A general route to selectively protected polyaza macrocycles has been developed using a mixture of diethylphosphoryl and tosyl groups for protection of linear chain polyamines. Condensation of N-(diethoxy-phosphoryl)-N',N''-ditosydiethylenetriamine (1a), N,N''-bis(diethoxyphosphoryl)-N'-tosyldiethylenetriamine (1b) and N,N',N''-tri(diethoxyphosphoryl)diethylenetriamine (1c) with mesylates or tosylates 2 gave the corresponding macrocycles 3 in reasonable yield. The phosphoryl group was selectively removed with gaseous HCl in excellent yield.
Synthesis of selectively protected polyaza macrocycles
作者:Ligang Qian、Zhong Sun、Mathias P. Mertes、Kristin Bowman Mertes
DOI:10.1021/jo00016a018
日期:1991.8
A general route to selectively protected polyaza macrocycles has been developed using a mixture of diethylphosphoryl and tosyl groups for protection of linear chain polyamines. Condensation of N-(diethoxy-phosphoryl)-N',N''-ditosydiethylenetriamine (1a), N,N''-bis(diethoxyphosphoryl)-N'-tosyldiethylenetriamine (1b) and N,N',N''-tri(diethoxyphosphoryl)diethylenetriamine (1c) with mesylates or tosylates 2 gave the corresponding macrocycles 3 in reasonable yield. The phosphoryl group was selectively removed with gaseous HCl in excellent yield.
Diethoxyphosphoryl as a Protecting-Activating Group in the Synthesis of Polyazacyclophanes
作者:Andrea Chellini、Roberto Pagliarin、Giovanni B. Giovenzana、Giovanni Palmisano、Massimo Sisti
The fully diethoxyphosphoryl(Dep)-protected polyamines 1b-3b were prepared from the corresponding polyamines with 'diethyl phosphite' (= diethyl phosphonate) and CCl4 in a solid base/organic liquid two-phase system in the presence of Bu4NBr as phase-transfer catalyst. Subsequent phase-transfer-catalyzed alkylation of phosphoramidates 1b-3b with bis(chloromethyl)arenes 5-8 in the presence of Bu4N(HSO4) followed by deprotection gave good yields of polyazacyclophanes 9a-16a.