Synthesis and biologic distribution of radioiodinated .beta.-adrenergic antagonists
作者:Robert N. Hanson、B. Leonard Holman、Michael A. Davis
DOI:10.1021/jm00206a025
日期:1978.8
Iodinated analogues 2, 7, and 8 were prepared from propranolol, practolol, and acebutolol in 30--50% yields. Radioisotopic exchange between carrier-free Na125I and the molten iodinated beta-adrenergic antagonist yielded the corresponding 125I-labeled product. The biodistribution in rats, determined at 15 and 60 min postinjection, indicated that the radioiodinated analogues of the cardioselective drugs practolol and acebutolol localized to a greater degree in the liver and heart than the analogue of propranolol. Conversely, [125I]iodopropranolol (2) was concentrated to a greater extent in the lungs than [125I]iodopractolol (7) or [125I]iodoacebutolol (8). Therefore, 123I- or 131I-labeled cardioselective beta-adrenergic antagonists, such as 7 or 8, may prove useful as radiodiagnostic agents for the external imaging of the myocardium.