1-(m-[211At]astatobenzyl)guanidine: synthesis via astato demetalation and preliminary in vitro and in vivo evaluation.

Published

Journal Article

No-carrier-added 1-(m-[211At]astatobenzyl)guanidine ([211At]MABG) was synthesized by astato demetalation using two different routes. The overall yield for the two-step approach from 3-(tri-n-butylstannyl)benzylamine was 13%. N-Chlorosuccinimide-mediated astato desilylation of 1-[3-(trimethylsilyl)benzyl]guanidine in acetic acid gave poor yields. In trifluoroacetic acid, the reaction worked well. The radiochemical yield was independent of reaction time and the amount of precursor used; however, the temperature of the reaction had a marked effect. Yields of 85% were obtained in 5 min at 70 degrees C using 0.5 mumol of the precursor. The percentage specific binding in vitro of [211At]MABG was nearly constant over a 2-log activity range and was comparable to that of no-carrier-added [131]MIBG. The accumulation of [211At]MABG in the heart and adrenals of normal mice was similar to that observed for no-carrier-added [131]MIBG.

Full Text

Duke Authors

Cited Authors

  • Vaidyanathan, G; Zalutsky, MR

Published Date

  • November 1992

Published In

Volume / Issue

  • 3 / 6

Start / End Page

  • 499 - 503

PubMed ID

  • 1463779

Pubmed Central ID

  • 1463779

International Standard Serial Number (ISSN)

  • 1043-1802

Language

  • eng

Conference Location

  • United States