The list illustrates the significant applicability of this one-pot zinc-mediated reductive amination. Nevertheless the protocol showed some limitations with selected substrates: i) Secondary amines failed to give tertiary amines; ii) hindered primary amines (e.g., tert-butylamine and 1-aminoadamantane) did not react; iii) aminoesters reacted giving low yields of the corresponding carboxylic acid derivative (ester hydrolysis occurring even with tert-butyl esters).
Although this combination appears to be plausible, its success is far from obvious: i) the reaction system is triphasic, resulting in complex and unpredictable phase dynamics of the involved chemical species; ii) the kinetics of the single processes may be mismatched, for example, imine formation may be slower than zinc oxidation by water; iii) carbonyl compounds are well-known to undergo different transformations under basic aqueous conditions, which may lead to extensive formation of byproducts.
Yes, it is worth bearing in mind there's a reaction mechanism for the formation of carbolines via a spirocyclic intermediate - where the imine N-methylene group attaches to the indole 3-position. (It's not strictly enolization though, as there's no 'ol' to be hadthe indole can enolize at the 3-position, which is acidic
)downwardsfromzero said:Yes, it is worth bearing in mind there's a reaction mechanism for the formation of carbolines via a spirocyclic intermediate - where the imine N-methylene group attaches to the indole 3-position. (It's not strictly enolization though, as there's no 'ol' to be hadthe indole can enolize at the 3-position, which is acidic)
Mindlusion said:um, you know ACRB contains large amounts of NMT too right? NMT is actually the primary alkaloid in ACRB, DMT is second most abundant...
So what do u advise me?![]()