通过铅氧化原位提供的1-苯基-环戊烯[1,2- d ] -1,2,3-rriazolo-5-spiro-4'-[perhydropyrazolino-3',5'-dione](5)四乙酸盐,即相应的环戊烯三唑-螺并吡唑并二酮6,被二烯截留,得到高产率的杂Diels-Alder加合物10-12。基于AM1MO计算检查了Diels-Alder反应。1 H-和13 C-nmr化学位移的总分配以及这些加合物的相对构型是借助2D(1 H- 1 H COSY,1 H - 1 H NOESY,1H- 13 C XHCORR,1 H- 13 C COLOC和NOE差异光谱。还通过分子建模检查了化合物11a和11b的结构。
Microwave Irradiation as an Efficient Tool for the Generation of N-Heterocyclic<i>o</i>-Quinodimethanes: Synthesis of Polyheterocyclic Compounds by Diels-Alder Reactions
作者:Ángel Díaz-Ortiz、María A. Herrero、Antonio de la Hoz、Andrés Moreno、José R. Carrillo
DOI:10.1055/s-2006-932460
日期:——
Microwave irradiation provides a general methodology for the generation of o-quinodimethanes derived from 1,2,4-triazine, pyrazole and 1,2,3-triazole. The cycloaddition reactions of such compounds with electron-deficient dienophiles allow the corresponding heteropolycyclic adducts to be obtained within 15 minutes in 51-87% yield.
Synthesis of Fused Cyclopenteno- and Cyclohepteno-Heterocycles
作者:G. E. Mertzanos、J. Stephanidou-Stephanatou、C. A. Tsoleridis
DOI:10.1080/00397919708006051
日期:1997.2
Cyclopenteno-triazoles, pyrazoles and isoxazoles 3a-i were synthesized from the reaction of various bishalomethyl substrates 1a-e with compounds containing active methylene groups 2a-c. In addition, seven membered ketodiesters 11 were synthesized from the reaction of 1 with dimethyl 3-oxoglutarate. Finally, from the ketodiester 11a the triazoleannelated bicyclo-undecadiones 12 were formed under phase transfer catalysis.