An Efficient Lewis Acid Catalyzed Povarov Reaction for the One-Pot Stereocontrolled Synthesis of Polyfunctionalized Tetrahydroquinolines
作者:Cristina Cimarelli、Samuele Bordi、Pamela Piermattei、Maura Pellei、Fabio Del Bello、Enrico Marcantoni
DOI:10.1055/s-0036-1589104
日期:2017.12
is expanded to the one-pot synthesis of N-alkyltetrahydroquinolines through a very efficient iminium-Povarov approach. A deeper insight on the reaction system was provided by the study on the side reactions occurring in the reaction conditions and on the nature of the stereoselectivity. An easy and efficient synthetic methodology for the one-pot stereocontrolledsynthesis of tetrahydroquinolines through
Fast and Efficient Synthesis of Pyrano[3,2-<i>c</i>]quinolines Catalyzed by Niobium(V) Chloride
作者:Mauricio Constantino、Luiz da Silva-Filho、Valdemar Lacerda Júnior、Gil da Silva
DOI:10.1055/s-2008-1067186
日期:2008.8
A highly efficient two-step method for the synthesis of pyranoquinoline derivatives from imino-Diels-Alder reactions between aldimines and 3,4-dihydro-2H-pyran using niobium(V) chloride as catalyst under mild conditions is described.
Proline triflate catalysed Diels–Alder reaction in the synthesis of tetrahydroquinoline derivatives
作者:Jianjun Li、Jia Li、Weike Su
DOI:10.3184/030823409x12474221035082
日期:2009.8
Proline triflate was found to catalyse efficiently the one-pot synthesis of 2H-pyranotetrahydroquinolines from aryl imines, and 3,4-dihydro-2H-pyran with high stereoselectivity. The aryl imines were formed in situ from aromatic amines and arylaldehydes.
previously described Lewis acidic POMs are reported. Competitive reactions between imines and aldehydes or between various imines demonstrated that fine tuning of the reactivity could be reached by varying the metal atom incorporated into the polyanionic framework. A series of experiments that employed pyridine derivatives allowed us to distinguish between the Lewis and induced Brønsted acidity of the POMs
报道了新的有机可溶性路易斯酸性多金属氧酸盐(POMs)的制备。这些络合物是通过将Zr,Sc和Y原子掺入相应的单腔道森[P 2 W 17 O 61 ] 10-和Keggin [PW 11 O 39 ] 7-多氧钨酸盐制备的。评价了这些化合物对C的催化活性。Diels-Alder,Mannich和Mukaiyama型反应中的C键形成。报道了与先前描述的路易斯酸性POM的比较。亚胺和醛之间或各种亚胺之间的竞争性反应表明,通过改变掺入聚阴离子骨架中的金属原子,可以实现反应性的精细调节。一系列使用吡啶衍生物的实验使我们能够区分POM的Lewis酸度和诱导的Brønsted酸度。这些催化剂以路易斯酸性方式活化亚胺,而醛通过间接布朗斯台德催化剂活化。