Synthesis and central nervous system actions of thyrotropin-releasing hormone analogs containing a 1-oxo-1,2,3,4-tetrahydroisoquinoline moiety.

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Abstract
In order to find compounds having selective central nervous system (CNS) actions, various thyrotropin-releasing hormone (TRH) analogs in which the pyroglutamic acid residue is replaced by (3S)-1-oxo-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylic acid (Otc-OH) and related derivatives were prepared and their CNS actions were investigated in mice.Otc-His-Pro-NH2 (9a) showed 3.5-10 times stronger CNS actions than TRH (1). However, it was also 3-4 times more potent than TRH in thyrotropin (TSH)-releasing activity.