Compounds of imaging agent with HDAC inhibitor for treatment of Alzheimer syndrome and method of synthesis thereof
A method of synthesizing a compound of imaging agent with HDAC (histone deacetylase) inhibitor consists of two parts, the first part of the method is to provide the inhibitor of HDAC with a compound of imaging agent that includes HDAC inhibitor BNL-26 (C 22 H 23 N 3 O) and its analogs to be labeled with radionuclide F-18, producing a series of new nuclear medicine tracers: BNL-26-CH 2 CH 2 18F, BNL-26a-CH 2 CH 2 18FF, BNL-26b-CH 2 CH 2 18F, BNL-26c-CH 2 CH 2 18F and BNL-26d-CH 2 CH 2 18F. These nuclear medicine with imaging agents can be used as a tracer in vivo binding to over-expression HDAC and produce a HDAC nuclear medicine imaging effect to serve for clinical diagnosis. The second part of the method is to provide a slightly adjusted a structural framework of BNL-26 and use pyridine to substitute the benzene ring of the BNL-26 structure, and then synthesize with other substituent to produce a series of additional 30 more HDAC inhibitors, named from Iner-1 to Iner-30 compounds.
1. A compound is selected from the group consisting of a group 1, a group 2, and a group 3, wherein the group 1 consists of (1) BNL-26-F18, (2) BNL-26a-F18, (3) BNL-26b-F18, (4) BNL-26c-F18, and (5) BNL-26d-F18 as shown below:
[ 18 F]N-(4-amino-4′-fluoro-[1,1′-biphenyl]-3-yl)-4-((dimethylamino)methyl)benzamide,
[ 18 F]N-(4-amino-4′-fluoro-[1,1′-biphenyl]-3-yl)-4-(dimethylamino)benzamide,
[ 18 F]N-(4-amino-4′-fluoro-[1,1′-biphenyl]-3-yl)-4-isopropylbenzamide,
[ 18 F]N-(4-amino-4′-fluoro-[1,1′-biphenyl]-3-yl)-4-isobutylbenzamide, and
[ 18 F]N-(4-amino-4′-fluoro-[1,1′-biphenyl]-3-yl)-4-propylbenzamide;
the group 2 consists of (1) BNL-26-CCF18, (2) BNL-26a-CCF18, (3) BNL-26b-CCF18, and (4) BNL-26c-CCF18 as shown below:
[ 18 F]4-((dimethylamino)methyl)-N-(4-((2-fluoroethyl)amino)-[1,1′-biphenyl]-3-yl)benzamide,
[ 18 F]4-(dimethylamino)-N-(4-((2-fluoroethyl)amino)-[1,1′-biphenyl]-3-yl)benzamide,
[ 18 F]N-(4-((2-fluoroethyl)amino)-[1,1′-biphenyl]-3-yl)-4-isopropylbenzamide, and
[ 18 F]N-(4-((2-fluoroethyl)amino)-[1,1′-biphenyl]-3-yl)-4-isobutylbenzamide; and
the group 3 is (1) BNL-26-CBF 18 as shown below:
[ 18 F]4-((dimethylamino)methyl)-N-(4-(4-fluorobenzamido)-[1,1′-biphenyl]-3-yl) benzamide.
2. An imaging agent comprising a compound of claim 1 and an HDAC inhibitor.
3. A method of synthesizing the compound selected from the group consisting of the group 1, the group 2, and the group 3 of claim 1 ,
wherein the method of synthesizing the compound of the group 1 in which the radionuclide 18 F is labeled on the para-position of a benzene ring as shown below:
wherein the method of synthesizing the compound of the group 2 of claim 1 in which the radionuclide 18 F is labeled on the NH 2 of a benzene ring, BNL-26-(CH 2 ) n 18 F, n=2 or 3, consisting of two types, as shown below:
(1) first type of labeling BNL-26-CH 2 CH 2 18 F
placing di-p-toluene sulfonic acid terephthalate TsOCH 2 CH 2 OTs and 18 [F]F − K + APE 2.2.2 in methanol and heating to about 85° C. for about 5 minutes to form TsOCH 2 CH 2 18 F;
placing BNL-26 and labeled TsOCH 2 CH 2 18 F in methanol and heating to about 85° C. for about 5 minutes, forming BNL-26-CH 2 CH 2 18 F;
(2) Second type of labeling BNL-26-CH 2 CH 2 18 F
placing TsOCH 2 CH 2 OTs and BNL-26 in methanol and heating to about 85° C. for about 5 minutes to form BNL-26-CH 2 CH 2 OTs;
placing BNL-26-CH 2 CH 2 OTs and 18 [F]F − K + APE 2.2.2 in methanol and heating to about 85° C. for about 5 minutes,
and forming BNL-26-CH 2 CH 2 18 F;
wherein the method of synthesizing the compound of the group 3 of claim 1 in which the radionuclide 18 F is labeled on the NH 2 of a benzene ring through benzene amide structure as shown below: