In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Annulation of Indoles with 1,n-Dibromoalkanes by a Pd(II)-Catalyzed and Norbornene-Mediated Reaction Cascade, published in 2020-04-30, which mentions a compound: 111-24-0, mainly applied to carbazole tetrahydro preparation regioselective; dibromoalkane indole tandem cyclization palladium catalyst, Recommanded Product: 111-24-0.
By employing 1,3-dibromopropane, 1,4-dibromobutane, and 1,5-dibromopentane as biselectrophiles, the annulation of indoles I (R = H, 5-Br, 4-CN, 5-t-BuO2C, etc.) was probed in the presence of PdCl2(CH3CN)2 as a catalyst and norbornene as a transpositional ligand. Ring formation to a five-membered ring was observed at positions C2 and N, while annulation of a six-membered ring occurred at positions C2 and C3. The latter cascade process was successfully applied to the direct synthesis of 1,2,3,4-tetrahydrocarbazoles II from indoles I (11 examples, 31-68% yields). Seven-membered-ring annulation was feasible by an initial coupling at position C2 followed by alkylation at C3.
There are many compounds similar to this compound(111-24-0)Recommanded Product: 111-24-0. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.
Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis