Asymmetric ring opening reactions of symmetrical N-acylaziridines with thiols catalyzed by chiral dialkyl tartrate-diethylzinc complexes

Catalytic enantioselective desymmetrization of meso-aziridines

As a type of readily available small strained-ring heterocycle, meso-aziridines may undergo catalytic desymmetrizing transformations to empower the rapid construction of diverse nitrogen-containing structures bearing contiguous stereocenters, which have great relevance in natural product synthesis, drug development and the design and synthesis of chiral catalysts/ligands for asymmetric catalysis. This review outlines the advances achieved in the catalytic asymmetric desymmetrization of meso aziridines and highlights some promising avenues for further work in this realm.

Recent advances in alkaline earth metal-enabled syntheses of heterocyclic compounds

This review summarizes recent progress in alkaline earth metal enabled syntheses of heterocyclic compounds.

Desymmetrization of aziridine with malononitrile using cinchona alkaloid amide/zinc(ii) catalysts

The catalytic enantioselective desymmetrization of aziridines with malononitrile has been developed.

Bimetallic catalysis in the highly enantioselective ring–opening reactions of aziridines

Structural and kinetic evidence for bimetallic mechanism.

Synthesis of enantiomerically enriched amino sulfide building blocks from acyclic chiral amino allylsilanes

An efficient synthesis of various protected syn-β-sulfenyl amides is described. These are prepared from the corresponding enantiopure amino allylsilanes which are in turn obtained from naturally occurring amino acids. The key step for introduction of the sulfur substituent is a diastereoselective electrophilic sulfodesilylation which is carried out with phthalimidesulfenyl chloride. The resulting homochiral β-phthalimidesulfenyl amines with an allylic sulforated stereogenic center are useful building blocks, as they represent a starting point for subsequent functional manipulations.

Catalytic asymmetric aza-Darzens reaction with a vaulted biphenanthrol magnesium phosphate salt

Conditions for a catalytic asymmetric aza-Darzens aziridine synthesis mediated by a vaulted biphenanthrol (VAPOL) magnesium phosphate salt is described. Using simple substrates, this methodology explores the scope and reactivity of a new magnesium catalyst for an aziridination reaction capable of building chirality and complexity simultaneously.

Chiral phosphoric acid-catalyzed desymmetrization of meso-aziridines with functionalized mercaptans

Conditions for the phosphoric acid-catalyzed highly enantioselective ring-opening of meso-aziridines with a series of functionalized aromatic thiol nucleophiles are described. The procedure utilizes commercially available aromatic thiols, a series of meso-aziridines, and a catalytic amount of VAPOL phosphoric acid to explore the substrate scope of this highly enantioselective reaction.

Diastereocontrolled synthesis of trans- and cis-meso-cyclopentene aziridines

[reaction: see text] The synthesis of novel substituted meso-aziridines is described: aziridination of 4-tert-butyldiphenylsilyloxy-cyclopent-1-ene is trans selective using Cu(I)/PhI=NSO(2)Ar and cis selective using PhNMe(3)(+)Br(3)(-)/Chloramine-T.

Effective ring-opening reaction of aziridines with trimethylsilyl compounds: A facile access to beta-amino acids and 1,2-diamine derivatives

Ring-opening reactions of aziridines with trimethylsilyl compounds triggered by tetrabutylammonium fluoride give the corresponding products regioselectively in excellent yield. It provides a facile and efficient procedure for the ring-opening reactions of aziridines and affords a practical access to the synthesis of cyano-, azido-, or chloroamines because of its efficiency and simplicity. The products are easily transformed to vicinal diamines or beta-amino acids.