Prins cyclization between a homoallylic alcohol and an aldehyde, promoted by trimethylsilyl halide, afforded 4-halo-tetrahydropyrans with good to excellent yields. Thanks to the absence of the solvent and metal, the THP thus obtained have been implicated without purification in several other reactions, in a sequential way, affording in particular new indole derivatives.
Compact polymerized polydiacetylene-micelles with "stealth" zwitterionic surface coating were assembled and tested in a murine xenograft model of breast cancer. In vivo fluorescence imaging indicated accumulation in the tumor area and histological studies revealed predominant uptake of the micelles at the margins of the tumor, thereby allowing the delineation of its volume.
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