Design and synthesis of carbon-11-labeled dual aromatase-steroid sulfatase inhibitors as new potential PET agents for imaging of aromatase and steroid sulfatase expression in breast cancer.
Aromatase and steroid sulfatase (STS) are particularly attractive targets in the treatment of estrogen-receptor-positive breast cancer and the development of enzyme-based cancer imaging agents for the biomedical imaging technique positron emission tomography (PET). New carbon-11-labeled sulfamate derivatives were first designed and synthesized as potential PET dual aromatase-steroid sulfatase inhibitor (DASSI) radiotracers for imaging of aromatase and STS expression in breast cancer. The target tracers 5-(((4-cyanophenyl)(4H-1,2,4-triazol-4-yl)amino)methyl)-2-[(11)C]methoxyphenyl sulfamate ([(11)C]8a) and 4-(((4-cyanophenyl)(4H-1,2,4-triazol-4-yl)amino)methyl)-2-[(11)C]methoxyphenyl sulfamate ([(11)C]8b) were prepared from their corresponding precursors 5-(((4-cyanophenyl)(4H-1,2,4-triazol-4-yl)amino)methyl)-2-hydroxyphenyl sulfamate (16) and 4-(((4-cyanophenyl)(4H-1,2,4-triazol-4-yl)amino)methyl)-2-hydroxyphenyl sulfamate (21) with [(11)C]CH(3)OTf under basic conditions through the O-[(11)C]methylation and isolated by the reversed-phase high pressure liquid chromatography (HPLC) method in 30-45% radiochemical yields based on [(11)C]CO(2) and decay corrected to end of bombardment (EOB). The specific activity at end of synthesis (EOS) was 111-185GBq/micromol.
Wang
Min
M
Department of Radiology, Indiana University School of Medicine, 1345 West 16th Street, L3-208, Indianapolis, IN 46202, USA.
Mickens
Jarrett
J
Gao
Mingzhang
M
Miller
Kathy D
KD
Sledge
George W
GW
Hutchins
Gary D
GD
Zheng
Qi-Huang
QH
D001141:Aromatase / Q000378:metabolism*; D047072:Aromatase Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism; D001943:Breast Neoplasms / Q000000981:diagnostic imaging* / Q000235:genetics*; D002250:Carbon Radioisotopes; D015195:Drug Design; D015972:Gene Expression Regulation, Neoplastic; D007553:Isotope Labeling; D049268:Positron-Emission Tomography; D011854:Radiochemistry; D043266:Steryl-Sulfatase / Q000037:antagonists & inhibitors*; D013451:Sulfonic Acids / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism
D047072:Aromatase Inhibitors; D002250:Carbon Radioisotopes; D013451:Sulfonic Acids; C005741:sulfamic acid; D001141:Aromatase; D043266:Steryl-Sulfatase