摘要:
We describe the synthesis of C-11-labeled alpha-aminoisobutyric acid 2 from iodo[C-11] methane and methyl N-(diphenylmethylen)-D,L-alaniate (5). The tetrabutylammonium fluoride (TBAF)-promoted alpha-[C-11] methylation of sterically hindered analog 5 was a key step in our synthesis process. Total radiochemical conversion of 2 was high and a remote-controlled synthesis was carried out. A comparative tumor positron emission tomography (PET) imaging study using the same model mouse showed higher uptake of 2 than with C-11-labeled methionine and [F-18] fluorodeoxyglucose (FDG). (C) 2011 Elsevier Ltd. All rights reserved.