Stereoselective Synthesis of Trisubstituted Aziridines with N-α-Diazoacyl Camphorsultam
摘要:
A Bronsted acid-catalyzed reaction of alpha-substituted alpha-diazocarbonyl compounds bearing camphorsultam as a chiral auxiliary and N-alkoxycarbonyl imines was implemented as an unprecedented means to provide trisubstituted aziridines in a highly stereodefined manner.
Generation of aziridinyllithiums from sulfinylaziridines by the ligand exchange reaction of sulfoxides with tert-butyllithium: Their properties and an application to asymmetric synthesis of α-dialkylamino acid ester
sulfinylaziridines by the ligand exchange reaction of sulfoxides with tert-butyllithium. The aziridinyllithiums were found to be stable in THF at below −30 °C and reactive with several electrophiles such as carbonyl compounds. Synthesis of an optically active α-dialkylamino acid ester was realized via the aziridinyllithium starting from optically active chloromethyl p-tolyl sulfoxide.
A Bronsted acid-catalyzed reaction of alpha-substituted alpha-diazocarbonyl compounds bearing camphorsultam as a chiral auxiliary and N-alkoxycarbonyl imines was implemented as an unprecedented means to provide trisubstituted aziridines in a highly stereodefined manner.
Generation of Aziridinyllithiums from Sulfinylaziridines with tert-Butyllithium: Properties, Reactivity, and Application to a Synthesis of α,α-Dialkylamino Acid Esters and Amides Including an Optically Active Form
aziridinyllithiums having several alkyl groups were investigated. As an extension of this method, a synthesis of α,α-dialkylamino acid esters, including an opticallyactive form, and amides was realized via the aziridinyllithiums. N-Non substituted α,α-dialkylamino acid esters were synthesized starting from N-(4-methoxyphenyl) aldimine.