Coupling Polymorphism/Solvatomorphism and Physical Stability Evaluation with Early Salt Synthesis Optimization of an Investigational Drug

Polymorphism Dependent Cytotoxicity, Cellular Uptake, and Live Cell Imaging Studies on Napthalimide-Vinyl-Phenothiazine Conjugate

Polymorphism-dependent cytotoxicity and cellular uptake of drug molecules have been studied for the past two decades. However, the visualization of polymorph-dependent cellular uptake and cytotoxicity using microscopy imaging techniques has not yet been reported. The luminescent polymorph is an ideal candidate to validate the above hypothesis. Herein, we report the polymorph-dependent cellular uptake, cytotoxicity, and bio-imaging functions of polymorphs 1Y and 1R of a naphthalimide-phenothiazine dyad. These polymorphs show different luminescence colors in the solid state and exhibit aggregation-induced enhanced emission (AIEE) in the DMSO-Water mixture. Bioimaging, cytotoxicity assay, and fluorescence-activated cell sorting (FACS) studies revealed that these polymorphs show different levels of cytotoxicity, cellular uptake, localization, and imaging potential. Detailed photophysical, morphological, and biological studies revealed that the difference in molecular conformation in these polymorphs enables them to form aggregates of different sizes and morphology, which leads to the differential uptake of these into the cells and consequently shows different cytotoxicity and imaging potentials.

A highly enantioselective synthetic method towards the α2c-adrenoceptor antagonist ORM-10921

The preparation of ORM-10921, a selective α_2C-adrenoceptor antagonist with promising anti-psychotic properties, was successfully achieved using asymmetric α-alkylation of α,β-unsaturated imide and Bischler–Napieralski cyclization/asymmetric reduction as the key steps.

1D hacksaw chain bipyridine–sulfonate Schiff base-dicopper(ii) as a host for variable solvent guests

The current study related to five solvatomorphs containing the 1D hacksaw chain of bipyridine–sulfonate Schiff base-dicopper(ii) as a host provides the first example of a polymeric copper(ii) system with five interconvertible solvatomorphic forms.