Syntheses of nitrogen heterocycles by means of amine-directed carbonylation and hydrocarbonylation
摘要:
Amine-directed carbonylation of 2-allylpiperidine (5) gives 8-methyl-1-azabicyclo[4.3.0]nonan-9-one (7) with extremely high regio- and stereoselectivity, which is promoted by a stoichiometric amount of [RhCl(CO)2]2 in the presence of hydrogen chloride. A catalytic version of this process is developed, which converts 5-benzylamino-1-pentene (9) to 1-benzyl-3-methyl-2-piperidinone (10) selectively. Novel aminocarbocyclization of 9 gives 1-benzyl-3-methylpiperidine (12) or 1-benzylazepane (13) exclusively by employing appropriate hydrocarbonylation conditions. The scope and limitation of these new processes are discussed.
Catalytic Ring Expansion of Cyclic Hemiaminals for the Synthesis of Medium‐Ring Lactams
作者:Wanxiang Zhao、Hui Qian、Zigang Li、Jianwei Sun
DOI:10.1002/anie.201504926
日期:2015.8.17
A mild and efficient intermolecular ring‐expansion approach was developed for the synthesis of medium‐ringlactams by using siloxy alkynes. Key to success is the suitable combination of a superior catalyst and an exceptional nitrogen‐protecting group. Control experiments indicated that the reaction is remarkably selective toward the desired lactam formation, even with many possible non‐productive pathways
Photochemical Rearrangement of <i>N</i>-Chlorolactams: A Route to <i>N</i>-Heterocycles through Concerted Ring Contraction
作者:Dana K. Winter、Alexandre Drouin、Jean Lessard、Claude Spino
DOI:10.1021/jo100181h
日期:2010.4.16
We report a novel ringcontraction allowing the direct conversion of N-chlorolactams to their corresponding ring-contraction N-heterocycles upon photolysis. Results show that the rearrangement occurs with a variety of N-chlorolactams and that the greater the substitution at the migrating carbon, the greater the yield of product. Importantly, stereochemistry at the migrating carbon is conserved in the
Heterobicyclic and tricyclic nitric oxide synthase inhibitors
申请人:——
公开号:US20010044539A1
公开(公告)日:2001-11-22
The current invention discloses useful bicyclic and tricyclic amidino derivative compounds, pharmaceutical compositions containing these novel compounds, and to their use as nitric oxide synthase inhibitors.
The invention relates to novel substituted oxazolidinones, to processes for preparation thereof, to the use thereof for treatment and/or prophylaxis of diseases, and to the use thereof for producing medicaments for treatment and/or prophylaxis of diseases, especially of thromboembolic disorders.
effective reagent for carrying out photolytically initiated radicalallylationreactions, as also proved by EPR experiments. In the presence of suitable azides that can give rise to electrophilic radicals, a homolytic chain reaction occurs with formation of allylated compounds. With δ-azido esters and chlorides generation of primary indiumaminyl radicals is followed by a very efficient 1,5-H shift process