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As mentioned, it was of interest to further transform precipitated products (after redissolution in a suitable solvent) using polymer-supported reagent and scavenger techniques. This approach utilizes a tactical combination of classical solution-phase synthesis followed by ¡°chemically driven¡± synthesis and purification. As a first example of precipitation followed by a polymerassisted reaction, we prepared 2-aminothiazole hydrobromide monohydrates on the Quest 210 synthesizer (7-mmol scale), redissolved the solid products in solvent (e.g., methanol or dimethylformamide), and freebased the compounds in the same reaction vessel using polymer-supported bases (Scheme 2). Two polymeric bases were found to be effective: MP-Carbonate (Macroporous triethylammonium methyl polystyrene carbonate resin), a resin-bound equivalent of potassium carbonate (K2CO3)10¨C12 and PS-DIEA (N,N-(Diisopropyl) aminomethyl- polystyrene) resin.13 The efficiency of neutralization was monitored by 1H NMR. After neutralization, it was found that the chemical shifts for H-5 (S-CH, singlet) for the aminothiazole hydrobromide salts 7, 8, 9 (d 7.24, 7.03, 7.34 ppm) were shifted upfield (d 7.02, 6.73, and 7.10 ppm) in free-based aminothiazoles 16, 17, 18. Protons for the NH2 group for free-based aminothiazoles 16, 17, 18 were also found to be broad singlets (d 7.05, 6.91, and 7.03 ppm), which was also diagnostic of the extent of neutralization. Results summarizing the preparation of free-based 2-aminothiazoles are provided in |
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