Applied Enantioselective Aminocatalysis: α-Heteroatom Functionalization Reactions on the Carbapenem (β-Lactam Antibiotic) Core

A Review on Recent Advances in Nitrogen-Containing Molecules and Their Biological Applications

The analogs of nitrogen-based heterocycles occupy an exclusive position as a valuable source of therapeutic agents in medicinal chemistry. More than 75% of drugs approved by the FDA and currently available in the market are nitrogen-containing heterocyclic moieties. In the forthcoming decade, a much greater share of new nitrogen-based pharmaceuticals is anticipated. Many new nitrogen-based heterocycles have been designed. The number of novel N-heterocyclic moieties with significant physiological properties and promising applications in medicinal chemistry is ever-growing. In this review, we consolidate the recent advances on novel nitrogen-containing heterocycles and their distinct biological activities, reported over the past one year (2019 to early 2020). This review highlights the trends in the use of nitrogen-based moieties in drug design and the development of different potent and competent candidates against various diseases.

Crystal structure of 2-(bis(3,5-dimethylphenyl) ((methyldiphenylsilyl)oxy)methyl) pyrrolidine, C34H39NOSi

C34H39NOSi, triclinic, P1̅ (no. 2), a = 10.0901(2) Å, b = 11.5016(2) Å, c = 14.4098(3) Å, α = 69.207(1)°, β = 86.555(2)°, γ = 65.579(3)°, V = 1416.10(6) Å3, Z = 2, R gt(F) = 0.0463, wR ref(F 2) = 0.1200, T = 100(2) K.

An unexpected re-arrangement of the antibiotic carbapenem core to new 1,4-diazepin-5-one scaffolds

Herein we report a peculiar organocatalyzed domino-reaction on the carbapenem core structure.

Recent advances in β-lactam synthesis

During the past century, β-lactams have been identified as the core of penicillin and since then several strategies have been developed for their synthesis.

Enantioselective Organocatalyzed Transformations of β-Ketoesters

The β-ketoester structural motif continues to intrigue chemists with its electrophilic and nucleophilic sites. Proven to be a valuable tool within organic synthesis, natural product, and medicinal chemistry, reports on chiral β-ketoester molecular skeletons display a steady increase. With the reignition of organocatalysis in the past decade, asymmetric methods available for the synthesis of this structural unit has significantly expanded, making it one of the most exploited substrates for organocatalytic transformations. This review provides comprehensive information on the plethora of organocatalysts used in stereoselective organocatalyzed construction of β-ketoester-containing compounds.

Chemoselective room temperature E1cB N–N cleavage of oxazolidinone hydrazides from enantioselective aldehyde α-hydrazination: synthesis of (+)-1,4-dideoxyallonojirimycin

A room temperature method for hydrazide N–N cleavage is presented that completes enantioselective aldehyde α-hydrazination methodology.