Synthesis of Tetrasubstituted NH Pyrroles and Polysubstituted Furans via an Addition and Cyclization Strategy
作者:Zheng-Hui Guan、Liang Li、Mi-Na Zhao、Zhi-Hui Ren、Jianli Li
DOI:10.1055/s-0031-1289993
日期:2012.2
enamino esters with nitroolefins provides a straightforward and general method for the synthesis of tetrasubstituted NH pyrroles. This novel method tolerates a wide range of functionality, and allows for rapid elaboration of the nitroolefins into a variety of substituted pyrroles in good yields. Further, an efficient KOAc-promoted addition and cyclization protocol toward substituted furans has been
l-Proline-Catalyzed Cyclization of 6-Aminopyrimidine-4(3H)-ones with Nitroolefins: Synthesis of Polysubstituted 5-Arylpyrrolo[2,3-d]pyrimidin-4-ones
作者:Furen Zhang、Chunmei Li
DOI:10.1055/s-0036-1588757
日期:2017.7
A simple and efficient one-pot procedure for the synthesis of new pyrrolo[2,3- d ]pyrimidine derivatives has been established through an l -proline-catalyzed cyclization of 6-aminopyrimidine-4(3 H )-one with nitroolefins in water. The reaction at 80 °C in water gives various highly substituted pyrrolo[2,3- d ]pyrimidines in good to excellent yields. This procedure has the advantages of environmental
Studies on Organophosphorus Compounds; 71: A New and Facile Synthesis of 3,4-Disubstituted 2-Pyrrolephosphonates
作者:Chengye Yuan、Weisheng Huang
DOI:10.1055/s-1993-25884
日期:——
A new synthetic approach leading to 3,4-disubstituted diethyl 2-pyrrolephosphonates based on the reaction of nitroalkenes with diethyl isocyanomethylphosphonate in the presence of lithium diisopropylamide in satisfactory yields is reported.
A facile and efficient method for the synthesis of substituted pyrroles from enaminoesters and nitroolefins is reported. This general procedure provides a wide variety of multisubstituted pyrroles in good to excellent yields under mild reaction conditions.
An efficient approach for the synthesis of 2,6‐dimethyl‐1,3‐diarylpyrano[4,3‐b]pyrrol‐4(1H)‐one derivatives has been established. The reaction was performed in aqueous media using readily available and inexpensive 6‐methyl‐4‐(phenylamino)‐2H‐pyran‐2‐one and nitroolefin as substrates. The present methodology shows many attractive advantages, such as using water as green reaction media, inexpensive and
建立了一种有效的合成2,6-二甲基-1,3-二芳基吡喃并[4,3 - b ]吡咯-4(1 H)-one衍生物的方法。反应在水性介质中进行,使用容易获得且便宜的6-甲基-4-(苯基氨基)-2 H-吡喃-2-酮和硝基烯烃作为底物。本方法学显示出许多诱人的优势,例如使用水作为绿色反应介质,使用廉价且环保的乙酸作为催化剂,易于操作,并且收率良好。