Chemistry is traditionally divided into organic and inorganic chemistry. Application In Synthesis of 7-Nitro-1,2,3,4-tetrahydroisoquinoline, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 42923-79-5
CuI-catalyzed C1-alkynylation of tetrahydroisoquinolines (THIQs) by A 3 reaction with tunable iminium ions
A CuI-catalyzed A3 (amines, aldehydes and alkynes) reaction of tetrahydroisoquinolines (THIQs), aldehydes, and alkynes to give C1-alkynylated THIQ products (endo-yne-THIQs) was developed. This redox neutral C1-alkynylation of THIQs, which was conducted under mild conditions, has a broad scope for the used aldehydes and alkynes. It was proposed that the A3 reaction first generates in situ exo-iminium ions, which then isomerize to endo-iminium ions and react with copper acetylides to give the endo alkynylated THIQs (endo-yne-THIQs).
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Reference：
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem