Synthesis of Fully Aliphatic Aziridines with a Macrocyclic Tetracarbene Iron Catalyst
摘要:
A second-generation aziridination catalyst supported by a borate-based dianionic macrocyclic tetracarbene ligand has been synthesized. The new macrocyclic tetracarbene iron(II) complex catalyzed the aziridination of alkyl azides and aliphatic alkenes showcasing the first fully aliphatic version of this C-2 + N-1 reaction. High isolated yields were obtained when no functional groups were present on the organic azides and alkenes, while modest yields were achieved when nonprotic functional groups were included. Even multiple functional groups can be added to the azide and alkene fragments to produce the most complex aziridines yet synthesized by this C-2 + N-1 catalytic reaction. The catalyst generated higher yields for aziridination with aryl azides and alkenes than the previously reported catalyst, [((TCPh)-T-Me,Et)Fe(NCCH3)(2)](PF6)(2). The contrast is particularly apparent with functionalized aryl azides where the second-generation catalyst now provides practical yields for synthetic chemistry. Finally, catalytic intramolecular aziridination was investigated since many natural products with aziridines feature bicyclic tertiary aziridines. For five- and six-membered rings, the bicyclic aziridines were formed catalytically, in contrast to previously studied catalyzed and uncatalyzed reactions.
Synthesis of Fully Aliphatic Aziridines with a Macrocyclic Tetracarbene Iron Catalyst
作者:Preeti P. Chandrachud、Heather M. Bass、David M. Jenkins
DOI:10.1021/acs.organomet.6b00066
日期:2016.6.13
A second-generation aziridination catalyst supported by a borate-based dianionic macrocyclic tetracarbene ligand has been synthesized. The new macrocyclic tetracarbene iron(II) complex catalyzed the aziridination of alkyl azides and aliphatic alkenes showcasing the first fully aliphatic version of this C-2 + N-1 reaction. High isolated yields were obtained when no functional groups were present on the organic azides and alkenes, while modest yields were achieved when nonprotic functional groups were included. Even multiple functional groups can be added to the azide and alkene fragments to produce the most complex aziridines yet synthesized by this C-2 + N-1 catalytic reaction. The catalyst generated higher yields for aziridination with aryl azides and alkenes than the previously reported catalyst, [((TCPh)-T-Me,Et)Fe(NCCH3)(2)](PF6)(2). The contrast is particularly apparent with functionalized aryl azides where the second-generation catalyst now provides practical yields for synthetic chemistry. Finally, catalytic intramolecular aziridination was investigated since many natural products with aziridines feature bicyclic tertiary aziridines. For five- and six-membered rings, the bicyclic aziridines were formed catalytically, in contrast to previously studied catalyzed and uncatalyzed reactions.
Analgesic N-[2-(furyl-methylamino and 2-thienylmethylamino)cycloaliphatic]b
申请人:The Upjohn Company
公开号:US04215114A1
公开(公告)日:1980-07-29
Cis - and trans-N-(2-aminocycycloaliphatic)benzamide compounds of the formula ##STR1## e.g., N-methyl-N-[2-[(2-furylmethyl)methylamino]-cyclohexyl]-3,4-dichlorobenzami de, and their pharmaceutically acceptable salts, have been found to have potent analgesic activity, and compositions containing these compounds useful in pharmaceutical dosage unit form for alleviating pain in warm-blooded animals, as well as methods for alleviating pain in animals with these compositions. Processes for preparing the compounds are also disclosed.