One-Step Synthesis of Diverse Pyridine-Containing Heterocycles with 3-Ethoxycyclobutanones at Room Temperature
作者:Yun Lin、Xinglin Yang、Weidong Pan、Yu Rao
DOI:10.1021/acs.orglett.6b01027
日期:2016.5.6
An efficient and convenient approach toward a diversity-oriented synthesis of bioactive pyridine-containing fused heterocycles is described. Through a Lewis acid catalyzed union of 3-ethoxycyclobutanones with various heterocyclic amines, a broad range of heterocycliccompounds were prepared readily at ambient temperature with excellent regioselectivity.
A new regio- and stereoselective synthesis of β-enamino ketones with 3-ethoxycyclobutanones and substituted amines
作者:Pengfei Liu、Gang Shan、Shi Chen、Yu Rao
DOI:10.1016/j.tetlet.2011.12.040
日期:2012.2
A new method toward regio- and stereoselectivesynthesis of β-enamino ketones is described. Through Lewis acid-catalyzed reactions between 3-ethoxycyclobutanones and substituted amines, a variety of cis and trans β-enamino ketone derivatives were prepared with complete regio- and stereoselectivity at room temperature.
An efficient method towards synthesis of 1,10-phenanthrolines is described. Through Lewis acid-catalyzed annulation reaction between 3-ethoxycyclobutanones and 8-aminoquinolines, a variety of unsymmetric and symmetric 1,10-phenanthroline derivatives were readily prepared with high regioselectivity at room temperature.
A New Synthesis of 2,3-Di- or 2,3,3-Trisubstituted 2,3-Dihydro-4-pyridones by Reaction of 3-Ethoxycyclobutanones and <i>N</i>-<i>p</i>-Toluenesulfonyl Imines Using Titanium(IV) Chloride: Synthesis of (±)-Bremazocine
N-p-Toluenesulfonyl (Ts) aldimines reacted with 3-ethoxycyclobutanones by catalysis of titanium(IV) chloride to afford 2,3-di- or 2,3,3-trisubstituted N-Ts-2,3-dihydro-4-pyridones. Synthesis of (+/-)-bremazocine was efficiently accomplished by using this method.
A New Synthesis of Pyrazoles through a Lewis Acid Catalyzed Union of 3-Ethoxycyclobutanones with Monosubstituted Hydrazines
作者:Gang Shan、Pengfei Liu、Yu Rao
DOI:10.1021/ol2002682
日期:2011.4.1
A new efficient and convenient approach toward the synthesis of pyrazoles is described. Through a Lewis acid catalyzed union of 3-ethoxycyclobutanones with monosubstituted hydrazines, a variety of pyrazole derivatives were prepared readily at ambient temperature with complete regioselectivity.