Short and straightforward synthesis of 1,7-dimethyl-1,4,7,10-tetraazacyclododecane
摘要:
A novel, cost-effective, and efficient process for the synthesis of 1,7-dimethyl-1,4,7,10-tetraazacyclododecane 1 has been developed. The two-step process involved the selective conversion of commercially available cyclen to N1,N7-diethylcarbamate cyclen 3 that afforded the title compound in high yield after the reduction step. (C) 2010 Elsevier Ltd. All rights reserved.
pH-Controlled Selective Protection of Polyaza Macrocycles
作者:Zoltan Kovacs、A. Dean Sherry
DOI:10.1055/s-1997-1418
日期:1997.7
Piperazine (1), tetraazacyclododecane 3 and pentaazacyclopentadecane 4 react with chloroformates in acid solution to give the selectively protected carbamate derivatives 1a, 3a-d, and 4a. The benzyloxycarbonyl derivatives 3d and 4a were alkylated with tert-butyl bromoacetate and removal of the benzyloxycarbonyl protection by catalytic hydrogenation afforded tert-butyl esters 5b and 6b in good yields.
A general synthesis of 1,7-disubstituted 1,4,7,10-tetraazacyclododecanes
作者:Zoltan Kovacs、A. Dean Sherry
DOI:10.1039/c39950000185
日期:——
1,4,7,10-Tetraazacyclododecane reacts regioselectively in acid solution with several chloroformates to give 1,7-diprotected derivatives which could be alkylated and deprotected to afford 1,7-disubstituted 1,4,7,10-tetraazacyclododecanes.
A novel, cost-effective, and efficient process for the synthesis of 1,7-dimethyl-1,4,7,10-tetraazacyclododecane 1 has been developed. The two-step process involved the selective conversion of commercially available cyclen to N1,N7-diethylcarbamate cyclen 3 that afforded the title compound in high yield after the reduction step. (C) 2010 Elsevier Ltd. All rights reserved.