Chiral rhodium(II,II) dimers catalyzed enantioselective intramolecular aziridination of sulfonamides and carbamates
作者:Jiang-Lin Liang、Shi-Xue Yuan、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1016/s0040-4039(03)01409-6
日期:2003.7
The asymmetricintramolecular aziridination of unsaturated sulfonamides and carbamates catalyzed by chiraldirhodium(II,II) complexes were achieved in good yields (up to 95%) and enantioselectivity (up to 76% e.e.).
Stereochemical Aspects of the Iodine(III)-Mediated Aziridination Reaction of Some Cyclic Allylic Carbamates
作者:Albert Padwa、Thomas Stengel
DOI:10.1021/ol0259490
日期:2002.6.1
[reaction: see text] The iodine(III)-mediated aziridination reaction of an indolyl-substituted carbamate requires a Rh(II) catalyst and proceeds by a metallonitrene intermediate. Stepwise addition across the indole pi-bond followed by Rh(II) detachment generates a metal-free zwitterion, which ultimately leads to the observed products. In contrast, intramolecular aziridination of several cycloalkenyl
Rhodium(II)-Catalyzed Aziridination of Allyl-Substituted Sulfonamides and Carbamates
作者:Albert Padwa、Andrew C. Flick、Carolyn A. Leverett、Thomas Stengel
DOI:10.1021/jo048990k
日期:2004.9.1
products in high yield. In contrast, the intramolecular aziridination of several cycloalkenyl-substituted carbamates did not require a Rh(II) catalyst and proceeded via an iminoiodinane intermediate. The resulting tricyclic aziridines underwent ring opening when treated with various nucleophiles to give anti-derived products as expected for nucleophilicattack at the three-membered ring. The iodine(III)-mediated