New discoveries in chemical research and development in 2021. 33537-99-4, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33537-99-4, Name is 6-Chloro-1,2,3,4-tetrahydroisoquinoline, molecular formula is C9H10ClN. In a Article，once mentioned of 33537-99-4
Two series of 2-butyl-8-azaspiro[5,4]decane-7,9-dione (a) and N-phthalimidobutyl (b) derivatives of 1,2,3,4-tetrahydroisoquinoline (THIQ) were synthesized. The impact of substituent variations in the aromatic part of the THIQ moiety on 5-HT1A and 5-HT2A receptor affinities, as well as in vivo functional properties of the investigated compounds are discussed. It was found that those modifications improved 5-HT2A receptor affinity, but also slightly reduced the binding affinity for 5-HT1A receptors (in comparison with the unsubstituted THIQ derivatives 3a and 3b). The most active compound (8-Br,5-OCH3-THIQ – 8a) showed features of a 5-HT1A (postsynaptic)/5-HT2A receptor antagonist. Additionally, all chloro derivatives with high and equal affinity for 5-HT1A receptors revealed different functional properties, i.e. an agonistic activity of presynaptic 5-HT1A receptors (4a) and a partial agonistic activity of postsynaptic 5-HT1A receptors (4a, 6a) or an antagonistic activity of postsynaptic ones (5a).
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Reference：
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem