Expedited SAR study of high-affinity ligands to the alpha(2)delta subunit of voltage-gated calcium channels: Generation of a focused library using a solution-phase Sn2Ar coupling methodology.

The SAR of the lead compound 3, a novel ligand for the alpha(2)delta subunit of voltage-gated calcium channels, was rapidly explored. Utilizing a parallel solution-phase Sn2Ar coupling approach, a focused library was obtained. The library was evaluated in vitro and afforded a series of analogues with improved potencies.

Expedited SAR study of an mGluR5 antagonists: generation of a focused library using a solution-phase Suzuki coupling methodology.

The SAR of the lead compounds 2a and 2b was rapidly explored. Utilizing a parallel solution-phase Suzuki coupling approach, in tandem with strong cation exchange resin (SCX) purification afforded the desired focused library. The library was evaluated in vitro, a ninefold potency increase was achieved and the preference for ortho substitution of moderate steric bulk of the fourth, phenyl ring was identified.

Synthesis and biological evaluation of 6-aryl-6H-pyrrolo[3,4-d]pyridazine derivatives as high-affinity ligands of the alpha(2)delta subunit of voltage-gated calcium channels.

A novel class of 2H-pyrrolo[3,4-c]pyridazine ligands of the alpha (2) delta subunit of voltage-gated calcium channels is described. Compound 4a with high affinity toward alpha (2) delta was identified through structure-activity relationship studies of the lead compound. Tritiated ligand [(3)H]-4b was synthesized to demonstrate that this ligand binds to the same site as Gabapentin toward alpha (2) delta subunit of voltage-gated calcium channels.

Synthesis and biological evaluation of 6-aryl-6H-pyrrolo[3,4-d]pyridazine derivatives: high-affinity ligands to the alpha 2 delta subunit of voltage gated calcium channels.

A novel class of 6-aryl-6H-pyrrolo[3,4-d]pyridazine ligands for the alpha2delta subunit of voltage-gated calcium channels has been described. Substitutions in the aryl ring of the molecule were generally not tolerated, and resulted in diminished binding to the alpha2delta subunit. Modifications to the pyridazine ring revealed numerous permissive substitutions, and detailed SAR studies were carried out in this portion of the molecule.