Intramolecular Cyclopropanation of Unsaturated Terminal Aziridines
摘要:
Regio- and stereoselective deprotonation of bishomoallylic terminal N-Bus (Bus = tert-butylsulfonyl)-protected aziridines generate aziridinyl anions that undergo diastereoselective intramolecular cyclopropanation giving trans-2-aminobicyclo[3.1.0]hexanes in good to excellent yields.
Asymmetric Synthesis of Terminal N-tert-Butylsulfinyl Aziridines from Organoceriums and an α-Chloroimine
摘要:
Addition of N-(2-chloroethylidene)-tert-butylsulfinamide to organocerium reagents in DMPU/THF (1:10) at -78 degrees C followed by warming to 25 degrees C provides terminal N-tert-butylsulfinyl aziridines in good yields (63-92%, nine examples) and diastereomeric ratios (85:15->99:1).
One-Carbon Homologation of <i>N</i>-Sulfonylaziridines to Allylic Amines Using Dimethylsulfonium Methylide
作者:David M. Hodgson、Matthew J. Fleming、Steven J. Stanway
DOI:10.1021/ol051124p
日期:2005.7.1
[reaction: see text]. Regio- and stereodefined allylic N-sulfonylamines are synthesized in high yields and under experimentally straightforward conditions by reaction of N-sulfonylaziridines with excess dimethylsulfoniummethylide.
Dimerization and Isomerization Reactions of α-Lithiated Terminal Aziridines
作者:David M. Hodgson、Philip G. Humphreys、Steven M. Miles、Christopher A. J. Brierley、John G. Ward
DOI:10.1021/jo701901t
日期:2007.12.1
The scope of dimerization and isomerization reactions of α-lithiated terminal aziridines is detailed. Regio- and stereoselective deprotonation of simple terminal aziridines with lithium 2,2,6,6-tetramethylpiperidide (LTMP) or lithium dicyclohexylamide (LiNCy2) generates trans-α-lithiated terminal aziridines. These latter species can then undergo dimerization or isomerization reactions depending on
Substituted Aziridines by Lithiation−Electrophile Trapping of Terminal Aziridines
作者:David M. Hodgson、Philip G. Humphreys、John G. Ward
DOI:10.1021/ol050060f
日期:2005.3.1
stereoselective deprotonation of N-Bus (Bus = tert-butylsulfonyl)-protected terminal aziridines with lithium 2,2,6,6-tetramethylpiperidide generates a nonstabilized (H-substituted) aziridinyl anion that undergoes in situ or external electrophile trapping under experimentally straightforward conditions to give trans-disubstituted aziridines in good to excellent yields.
Ring-opening reaction of Bus- and SES-protected aziridines using lithiated dithianes
作者:Ken Sakakibara、Kyoko Nozaki
DOI:10.1039/b814413c
日期:——
sulfonyl-activated aziridines using lithiated dithianes was investigated. Nucleophilic attack of lithiated dithianes on aziridines containing tert-butylsulfonyl (Bus) and 2-(trimethylsilyl)ethylsulfonyl (SES) demonstrated efficient ring cleavage to yield β-amino carbonyl equivalents, γ-lactam and syn- and anti-1,5-aminoalcohols. The first example of a ring-opening reaction of di-substituted aziridine using dithiane