Synthesis of 2-Alkynyl-1,4-cyclohexadienes via a Diels–Alder Reaction of Conjugated 2,4-Diynones
作者:Wesley Chalifoux、Khagendra Hamal、Radha Bam
DOI:10.1055/s-0035-1561451
日期:——
reactive dienophiles in the Diels–Alder cyclization reaction is of value in producing diversely functionalized, and therefore useful, cyclic products. We have developed a Diels–Alderreaction of conjugated 2,4-diynones, promoted by Lewis acids, to produce substituted 2-alkynyl-1,4-cyclohexadiene (‘skipped’ cyclohexadiene) products in good to excellent yields. The reaction was successful with a variety
Synthesis of linked heterocycles via use of bis-acetylenic compounds
作者:Christopher D. Smith、Kirill Tchabanenko、Robert M. Adlington、Jack E. Baldwin
DOI:10.1016/j.tetlet.2006.03.052
日期:2006.5
Linked bis-pyrazoles, a pyrazolyl-isoxazole, a pyrazolyl-pyrimidine and a pyrazolyl-triazole were synthesized starting with commercially available 1,4-bis(trimethylsilyl)-1,3-butadiyne 1 or readily available bis-acetylenic diketone 22. A stepwise approach based on the use of 1 allowed the synthesis of nonsymmetrically substituted bis-pyrazoles and linked heterocycles with two different cores whereas a symmetric approach based on the use of 22 allowed a very short synthesis of symmetric bis-pyrazoles. (c) 2006 Elsevier Ltd. All rights reserved.
New access to the 1H-pyrazolo[4,3-c]pyridine core from bis-acetylenic-N-benzoylhydrazones
作者:Laurent Commeiras、Samuel C Woodcock、Jack E Baldwin、Robert M Adlington、Andrew R Cowley、Peter J Wilkinson
DOI:10.1016/j.tet.2003.11.036
日期:2004.1
1H-pyrazolo [4,3-c]pyridines were obtained from bis-acetylenic-N-benzoylhydrazones using aqueous ammonia. (C) 2003 Elsevier Ltd. All rights reserved.