Convenient synthesis of crown ethers containing a hydrazine moiety
作者:Jerald S. Bradshaw、Krzysztof E. Krakowiak、Geng Wu、Reed M. Izatt
DOI:10.1016/s0040-4039(00)80819-9
日期:1988.1
A new class of crownethers containing a hydrazine moiety was synthesized in only 2, 3, or 4 steps starting from 1,2-diacetylhydrazine or 1,2-diethylhydrazine. Hydrazino-crown ethers with 2 or 4 nitrogen atoms in the ring were obtained by reacting the hydrazine derivatives with 1,11-diiodo-(or dichloro)-3,6,9-trioxaundecane, 4-allyloxymethyl-1,8-diiodo-3,6-dioxaoctane, 3-chloro-2-chloromethyl-1-propene
Convenient syntheses of N-[2-(2-hydroxyethoxy)ethyl]-substituted polyaza-crown ethers and cyclams without the need for a hydroxy blocking group
作者:Jerald S. Bradshaw、Krzysztof E. Krakowiak、Reed M. Izatt
DOI:10.1016/s0040-4039(01)80618-3
日期:1989.1
Short three or four step syntheses of N-[2-(2-hydroxyethoxy)ethyl]-substituted polyaza-crowns and cyclams without the need for a hydroxy blocking group are presented. Cyclization of a hydroxy-substituted diamine took place on the two amine nitrogen atoms because sodium carbonate does not ionize the hydroxy group.
The synthesis of new diaza-N-pivot lariat 15-crown-5 and 18-crown-6 macrocycles
作者:Jerald S. Bradshaw、Krzysztof E. Krakowiak、Haoyun An、Reed M. Izatt
DOI:10.1016/s0040-4020(01)86681-3
日期:1990.1
attached to one of the ring nitrogen atoms have been prepared in good yields. The ring closure step involved the reaction of a -secondary amine containing the tertiary aminoalkyl or hydroxyalkyl substituent with ethyleneglycol -(2-iodoethyl)ether or diethyleneglycol -(2-chloroethyl)ether plus sodium iodide. The starting tertiary aminoalkyl- or hydroxyalkyl-substituted -secondary aimine was prepared by reacting
Synthesis and in vitro antitumor activity of novel 2-alkyl-5-methoxycarbonyl-11-methyl-6H-pyrido[4,3-b]carbazol-2-ium and 2-alkylellipticin-2-ium chloride derivatives
Twenty-one types of novel ellipticine derivatives and pyridocarbazoles (5-methoxycarbonyl-11-methyl-6H-pyrido[4,3-b]carbazoles) with a nitrosourea moiety, linked by an oxydiethylene unit at the 2 position, were synthesized, and their cytotoxicity against HeLa S-3 cells was evaluated. Some of these new compounds exhibited potent antitumor activity by comparison with that of ellipticine. (C) 2014 Elsevier Masson SAS. All rights reserved.