Nucleophilic addition to N-alkoxyamides

Area of Science:

• Organic Synthesis
• Functional Group Chemistry

Background:

• Amide groups are prevalent in organic synthesis but are challenging substrates for nucleophilic addition due to their inherent stability.
• Nucleophilic addition to amide carbonyls is less explored compared to amide bond formation.

Purpose of the Study:

• To present recent advancements in the reactivity of N-alkoxyamides.
• To demonstrate the utility of N-alkoxyamides in overcoming the stability issues of traditional amides for nucleophilic addition.

Main Methods:

• Incorporation of an N-alkoxy group into the amide nitrogen to modulate reactivity.
• Development of a one-pot process for sequential introduction of two different nucleophiles.
• Utilizing the Schwartz reagent for a chemoselective reduction step.

Main Results:

• N-alkoxyamides facilitate nucleophilic addition, overcoming inherent stability challenges.
• A one-pot protocol allows for the introduction of two distinct nucleophiles, yielding a variety of substituted amines.
• High chemoselectivity was achieved during reduction in the presence of sensitive functional groups like esters.

Conclusions:

• N-alkoxyamides serve as effective platforms for controlled nucleophilic addition reactions.
• The developed methodology enables the synthesis of diverse substituted amines through a one-pot, two-nucleophile process.
• This approach facilitated the concise total synthesis of (±)-gephyrotoxin, showcasing its practical applicability.