The 2-cyclopropyl substituted benzimidazole 2 has been used as a starting point for further optimization of an LHRH antagonist series. SAR studies revealed that a tert-butyl urea fragment connected through a simple carbon chain would improve activity. Further modification of the benzylsulfonamide moiety led to the discovery of 23 (IC(50): 4.2 nM).

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http://dx.doi.org/10.1016/j.bmcl.2004.10.090DOI Listing

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