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 Asymmetric organocatalytic N-alkylation of indole-2-carbaldehydes with α,β-unsaturated aldehydes: one-pot synthesis of chiral pyrrolo[1,2-a]indole-2-carbaldehydes, published in 2010, which mentions a compound: 21778-81-4, mainly applied to pyrroloindolecarbaldehyde asym preparation; indolecarbaldehyde unsaturated aldehyde Michael addition cyclization diphenylsilyloxymethylpyrrolidine, Quality Control of 5-Methoxy-1H-indole-2-carbaldehyde.
Diphenylprolinol trimethylsilyl ether-catalyzed asym. aza-Michael addition/aldol addition of indole-2-carboxaldehyde with unsaturated aldehydes is described. A series of chiral pyrrolo[1,2-a]indole-2-carbaldehydes were obtained in good yields with excellent stereoselectivities.
Here is a brief introduction to this compound(21778-81-4)Quality Control of 5-Methoxy-1H-indole-2-carbaldehyde, if you want to know about other compounds related to this compound(21778-81-4), you can read my other articles.
Reference:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem