A series of dihydrotetrazolopyrimidine derivatives were prepared to utilize a three-component Biginelli reaction from ethyl 3-oxo butanoate, 5-amino tetrazole, and various aromatic aldehydes as reactants, pTSA as a Brønsted acid catalyst, and ethanol as the solvent. The structure of the prepared compounds was established by spectroscopic evidence, FTIR, HRMS, and NMR (1H- and 13C-) spectra. The electronic properties of the aromatic aldehyde's substituents affected the reaction's time and yield. Substituents possessing electron-donating character accelerated the reaction time but decreased the reaction yield, whereas substituents with electron-withdrawing properties slowed the reaction but increased the yield. The prepared compounds exhibited moderate to strong anti-proliferative activities against 4T1 and HeLa cancer cell lines. Compound Ethyl (E)-5-methyl-7-(1-phenylprop-1-en-2-yl)-4,7- dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylate and compound Ethyl 7-(1H-indol-3-yl)-5-methyl-4,7-dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylate) showed strong anti-proliferative activities in vitro through induction apoptotic cells death mechanism. In addition, five of the synthesized compounds exhibited better inhibitory activity of α-glucosidase than quercetin, the positive control.

Senyawa golongan dihidrotetrazolopirimidin dapat disintesis menggunakan Reaksi Biginelli. Senyawa etil 5-metil-7-(4-morfolinofenil)-4,7-dihidrotetrazolo[1,5a] pirimidin-6-karboksilat (MDP) merupakan senyawa organik baru terdiri atas cincin dihidrotetrazolopirimidin dengan gugus samping morfolinofenil. Penelitian sebelumnya menyebutkan bahwa senyawa pirimidin dan turunannya memiliki berbagai macam aktivitas farmakologi. Pada penelitian ini, senyawa MDP dianalisis menggunakan studi in silico untuk mengetahui potensi yang dimiliki sebagai agen terapi untuk mengatasi masalah kesehatan. Hasil analisis menunjukkan bahwa senyawa MDP berpotensi sebagai antimalaria, antikanker, dan antihiperurisemia dilihat dari binding energy yang bernilai negatif atau rendah. Interaksi senyawa MDP dengan reseptor yang bernilai paling negatif pada saat berinteraksi dengan protein XOD dibandingkan dengan nilai binding energy MDP dengan Kinesin Eg5 dan PfDHODH. Sehingga dapat disimpulkan bahwa senyawa MDP paling potensial jika digunakan sebagai antihiperurisemia dengan nilai binding energy sebesar -8,33 kkal/mol dengan konstanta inhibisi 0,79 µM. Kata kunci:   antihiperurisemia, antikanker, antimalaria,  dihidrotetrazolopirimidin, in silico Dihydrotetrazolopyrimidine derivatives can be synthezed using the Biginelli Reaction. Ethyl 5-methyl-7-(4-morpholinophenyl)-4,7-dihydrotetrazolo[1,5a]pyrimidine-6-carboxylate (MDP) is a new organic compound consisting of a dihydrotetrazolopyrimidine ring with morpholinophenyl moiety. Previous studies showed that pyrimidine compounds and their derivatives exhibited various pharmacological activities. In this study, MDP compound was analyzed using in silico studies to determine its potential to be used as therapeutic agent to overcome health problems. The results of the analysis showed that the MDP compound has potential activity as an antimalarial, anticancer, and antihyperuricemia, based on negative or low binding energy. The interaction of MDP compound with XOD protein showed the lowest binding energy compared to Kinesin Eg5 and PfDHODH. Based on the docking experiments performed, it can be concluded that MDP compound showed the most potential to be used as an antihyperuricemia with binding energy of -8.33 kcal/mol and inhibition concentration of 0,79 µM. Keywords: anticancer, antihyperuricemia, antimalarial, dihydrotetrazolopyrimidine, in silico

Vinylogous aldol condensation on some dihydropirimidine (DHPM) derivatives has been successfully performed using p-toluenesulfonic acid as a Brønsted acid catalyst. The pure products could be obtained without further purification. Employing this method, 20 styryldihydropyrimidine derivatives have been successfully synthesized wherein 19 of them are new compounds. The structures of the reaction products were elucidated by spectroscopic methods (IR, NMR, MS), while their cytotoxic activities were determined toward two cancer cell lines HeLa and MCF-7. Some compounds showed high activity better than doxorubicin as a positive control.