Ruthenium-NHC-Catalyzed Asymmetric Hydrogenation of Indolizines: Access to Indolizidine Alkaloids
作者:Nuria Ortega、Dan-Tam D. Tang、Slawomir Urban、Dongbing Zhao、Frank Glorius
DOI:10.1002/anie.201302218
日期:2013.9.2
complex serves as the catalyst for the high‐yielding and completely regioselective and asymmetrichydrogenation of substituted indolizines and 1,2,3‐triazolo‐[1,5‐a]pyridines. This method should provide ready access to bicyclic products bearing an N‐bridgehead, a motif appearing in 25–30 % of all naturally occurring alkaloids.
越过N桥!钌/ N-杂环卡宾(NHC)络合物可作为取代吲哚嗪和1,2,3-三唑并[1,5- a ]吡啶的高产率,完全区域选择性和不对称氢化的催化剂。该方法应使带有N桥头的双环产物易于获得,该花环出现在所有天然生物碱的25%至30%中。
Copper-catalyzed aerobic carboxygenation and N-arylation of [1,2,3]triazolo[1,5-a]pyridines towards pyridinium triazolinone ylides
Copper-catalyzed aerobic oxyarylation of [1,2,3]triazolo[1,5-a]pyridines is developed. Notably molecular oxygen was utilized as one of the reagents and the transformation resulted in the formation of novel pyridinium triazolinone ylides. A basic mechanism for the one-pot process is proposed and further functionalization of the ylidic products were also presented.
Copper(II) Acetate‐Catalyzed Synthesis of Phosphorylated Pyridines
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Denitrogenative C−P Coupling between Pyridotriazoles and P(O)H Compounds
作者:Ruwei Shen、Chao Dong、Jianlin Yang、Li‐Biao Han
DOI:10.1002/adsc.201800909
日期:2018.11.5
A new inexpensive copper‐catalyzed denitrogenative C−P coupling reaction of pyridotriazoles with P(O)H compounds has been developed. The reaction proceeds via a process of copper‐catalyzed P(O)−H insertion into the pyridyl carbene intermediates generated in situ from pyridotriazoles. This reaction provides a new and effective method for the synthesis of a variety of 2‐picolylphosphoryl compounds.
Triazolopyridines. 17. N2-dicyanomethylides: Synthesis, structure and reactivity with acetylenic dipolarophiles
作者:Belén Abarca、Rafael Ballesteros、Ana Muñoz、Gurnos Jones
DOI:10.1016/0040-4020(96)00572-8
日期:1996.7
Preparation and structure of 1,2,3-triazolo[1,5-a]pyridinium N2-dicyanomethylides 7a,b are described. Reaction with methyl propiolate gives trisubstituted indolizines 8a,b in good yield. Reaction of 7b with dimethyl acetylenedicarboxylate gives a quinolizine 12.