Polyfunctionalized, unprotected reagents (e.g. amines and thiols) can be used in the production of highly diverse compound libraries by performing sequential nucleophilic substitutions on support-bound polyelectrophiles (see scheme). The procedure reported here enables the efficient preparation of new beta-alanine derivatives which are suitable for lead discovery. E*=polyelectrophile, *=solid support.
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Zaragoza et al. (2000) studied this question.