A novel and efficient copper-catalyzed homocoupling of ketoxime carboxylates has been developed for the synthesis of symmetrical pyrroles. This reaction tolerates a wide range of functional groups and provides a synthetically useful process to synthesize valuable symmetrical pyrroles under mild conditions.
A photocatalytic formal [3+2] cycloaddition of 2H‐azirines with alkynes has been achieved under irradiation by visiblelight in the presence of organic dye photocatalysts. This transformation provides efficient access to highly functionalized pyrroles in good yields and has been applied to the synthesis of drug analogues. A primary trial of photocascade catalysis merging energy transfer and redox neutral
在有机染料光催化剂的存在下,在可见光照射下,已实现了2 H H叠氮基与炔烃的光催化形式[3 + 2]环加成反应。这种转化提供了以高收率高效获得高度官能化吡咯的途径,并已应用于药物类似物的合成。光级联催化合并能量转移和氧化还原中性反应的初步试验显示是成功的。
Oxidation of 3,4-disubstituted isoxazolin-5-ones
作者:Egle M. Beccalli、Alessandro Marchesini、B. Gioia
DOI:10.1002/jhet.5570170427
日期:1980.6
The oxidation of 3,4-disubstitutedisoxazolin-5-ones with active manganese dioxide leads to the formation of C-C and/or C-N linked coupling products.
Organische synthesen mit übergangsmetall-komplexen
作者:Rudolf Aumann、Heinrich Heinen
DOI:10.1016/0022-328x(90)80164-u
日期:1990.7
A β-tripyrane XI and cyclic β-trispyrrole XII were obtained by means of a novel two-step pyrrole synthesis from pentacarbonyl(1-amino-1-phenylmethylene)-chromium IV via an intermediate iminocarbene complex VI. VI adds alkynes VIIa–e to give the 1H-pyrroles Xa–e. Xe undergoes a rapid self-condensation with the formation of XI and XII.
A novel K2S2O8-promoted oxidativecyclization of enamines is described. A variety of enamines having diverse functional groups and substitution patterns react well using K2S2O8 as the oxidant in the absence of catalyst. This protocol provides a very simple route for the synthesis of polycarbonyl pyrroles and has the advantages of readily available starting materials, mild reaction conditions, and a
描述了新的由K 2 S 2 O 8促进的烯胺的氧化环化。在不存在催化剂的情况下,使用K 2 S 2 O 8作为氧化剂,具有不同官能团和取代方式的多种烯胺反应良好。该方案为聚羰基吡咯的合成提供了非常简单的途径,并具有易于获得的起始原料,温和的反应条件和广泛的底物的优点。