Improved Synthesis of 10-(2-Alkylamino-2-oxoethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic Acid Derivatives Bearing Acid-Sensitive Linkers
作者:Bhumasamudram Jagadish、Tarik J. Ozumerzifon、Sue A. Roberts、Gabriel B. Hall、Eugene A. Mash、Natarajan Raghunand
DOI:10.1080/00397911.2013.813547
日期:2014.2
provides convenient access to 10-(2-alkylamino-2-oxoethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid derivatives that contain acid-sensitive functional groups. The utility of the method is demonstrated by improved syntheses of two known 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid monoamides bearing acid-sensitive ω-tritylthio alkyl chains in much greater yields based on cyclen as
摘要 1,4,7-三(甲氧羰基甲基)-1,4,7,10-四氮杂环十二烷和1,4,7-三(乙氧羰基甲基)-1,4,7,10-四氮杂环十二烷的氢溴酸盐与适当的烷基化反应α-溴乙酰胺,然后水解,可以方便地获得含有酸敏感官能团的 10-(2-烷基氨基-2-氧乙基)-1,4,7,10-四氮杂环十二烷-1,4,7-三乙酸衍生物. 该方法的实用性通过两种已知的 1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸单酰胺的改进合成得到证明,这些单酰胺带有酸敏感的 ω-三苯甲基硫代烷基链,基于循环以更高的产率作为起始材料。[本文提供补充材料。访问出版商的 Synthetic Communications® 在线版本,获取以下免费补充资源: