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A new approach for the preparation of 2-substituted azole libraries using a polystyrene-carbamyl chloride resin in a traceless fashion is described. Azole substrates II are assembled in a one-pot condensation reaction of azoles and aldehydes with a resin-bound carbamyl chloride. Treatment of the azolyl-carbamate II with boron trifluoride etherate under thermal or microwave-assisted solvolysis conditions afforded 2-substituted azoles. [reaction: see text]
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Deng et al. (2002) studied this question.
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