Understanding the guest binding in the cucurbit[7]uril inclusion complexes of CDK4/6 inhibitors, palbociclib, and ribociclib from a combined experimental and computational study was written by Katiyar, Dharmendra;Ahamad, Shakir;Dash, Sibananda G.;Tripathi, Sarita;Arora, Ashish;Thakur, Tejender S.. And the article was included in Journal of Molecular Structure in 2021.Reference of 1211441-98-3 This article mentions the following:
We have studied the cucurbit[7]uril inclusion complexes of two anti-cancer drugs, palbociclib and ribociclib, in the solution and solid-state with the help of exptl. and computational approaches. The formation of the cucurbit[7]uril inclusion complex, binding stoichiometry, and binding free energies in aqueous solution was determined from 1H-NMR, UV-spectroscopy and ITC studies. The binding of drugs in the ionized and unionized forms with cucurbit[7]uril was studied with the help of QTAIM anal. and free energy computations. We report the development of new co-amorphous solids of the cucurbit[7]uril inclusion complexes of drugs with enhanced thermal stability. We also report three new crystalline salt forms of palbociclib oxalate and a new DMSO solvate of ribociclib succinate dihydrate in the study. The phase interrelationship between the palbociclib oxalate forms (1a, 1b, and 1c) was established from DSC and PXRD study. In the experiment, the researchers used many compounds, for example, 7-Cyclopentyl-N,N-dimethyl-2-((5-(piperazin-1-yl)pyridin-2-yl)amino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxamide (cas: 1211441-98-3Reference of 1211441-98-3).
7-Cyclopentyl-N,N-dimethyl-2-((5-(piperazin-1-yl)pyridin-2-yl)amino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxamide (cas: 1211441-98-3) belongs to piperazine derivatives. A form in which piperazine is commonly available industrially is as the hexahydrate, C4H10N2. 6H2O, which melts at 44 °C and boils at 125–130 °C. Piperazines are very broad chemical group, covering a wide range of drugs from antidepressants to antihistamines. The connecting property of all these chemicals is the presence of a piperazine functional group.Reference of 1211441-98-3
Referemce:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics