Novel Topical Cytokinin Improves Coarse Wrinkles and Skin Roughness Without Skin Irritation.

Objective: To evaluate the efficacy and tolerance of topical 4HBAP (para-topolin [6-(4-hydroxybenzylamino) purine], a new aromatic cytokinin, in subjects with mild to moderate facial photodamage.

Methods: In this single-center, 12-week study subjects (n=39) applied topical 0.10% 4HBAP (the test article) and sunblock (SPF30) twice daily, in the early morning and in the evening.

Synthesis, characterization and biological activity of ring-substituted 6-benzylamino-9-tetrahydropyran-2-yl and 9-tetrahydrofuran-2-ylpurine derivatives.

In an attempt to improve specific biological functions of cytokinins routinely used in plant micropropagation, 33 6-benzylamino-9-tetrahydropyran-2-ylpurine (THPP) and 9-tetrahydrofuran-2-ylpurine (THFP) derivatives, with variously positioned hydroxy and methoxy functional groups on the benzyl ring, were prepared. The new derivatives were prepared by condensation of 6-chloropurine with 3,4-dihydro-2H-pyran or 2,3-dihydrofuran and then by the condensation of these intermediates with the corresponding benzylamines. The prepared compounds were characterized by elemental analyses, TLC, HPLC, melting point determinations, CI+ MS and (1)H NMR spectroscopy.