Intramolecular Diels-Alder reactions of 1,2,4-triazines. Synthesis of 2,3-cyclopentenopyridines and 5,6,7,8-tetrahydroquinolines
摘要:
2,3-Cyclopentenopyridines and 5,6,7,8-tetrahydroquinolines are prepared by intramolecular Diels-Alder reactions of appropriately substituted 1,2,4-triazines. Two general routes to the requisite triazine precursors are described.
Catalytic co-cyclisation of α,ω-cyanoalkynes with alkynes: a versatile chemo- and regio-selective synthesis of 2,3-substituted 5,6,7,8-tetrahydroquinolines and other cycloalka[1,2-b]pyridines
作者:David J. Brien、Alaric Naiman、K. Peter C. Vollhardt
DOI:10.1039/c39820000133
日期:——
α,ω-Cyanoalkynes are catalytically cocylised with alkynes in the presence of dicarbonyl(cyclopentadiecyl)-cobalt to furnish [b]annuiated pyridineschemo- and regio-selectively.
在二羰基(环戊二烯基)-钴的存在下,将α,ω-氰基炔烃与炔烃催化羰基化,以化学和区域选择性地提供[ b ]环氧化的吡啶。
Easy Access to Isoquinolines and Tetrahydroquinolines from Ketoximes and Alkynes via Rhodium-Catalyzed C−H Bond Activation
作者:Kanniyappan Parthasarathy、Chien-Hong Cheng
DOI:10.1021/jo902084j
日期:2009.12.18
herein is a convenient and highly regioselective synthesis of substituted isoquinoline derivatives from various aromatic ketoximes and alkynes via a one-pot, rhodium-catalyzed C−H bondactivation. In addition, tetrahydroquinoline derivatives are formed in good yields from 2-arylidene-1-cyclohexanone oximes possessing an exocyclic double bond and from tetrahydroxanthone oximes. A possible mechanism is