3-烷氧羰基-2-氨基-4-芳基-4-第一不对称合成ħ -萘并[1,2- b ]吡喃,通过迈克尔加成1-萘酚于手性改性arylidenecyanoacetates的6和7进行说明。在1,4-共轭物添加物中已经获得了良好的产率和低的非对映异构体过量。在C-4中的吡喃主要的异构体的绝对立体化学8和9已通过主要吡喃的X射线分析指定为5 8。
Asymmetric Diels-Alder reactions of chiral (E)-2-cyanocinnamates with cyclopentadiene
作者:Carlos Cativiela、Jose A. Mayoral、Alberto Avenoza、Jesus M. Peregrina、Fernando J. Lahoz、Sergio Gimeno
DOI:10.1021/jo00043a025
日期:1992.8
Several chiral derivatives of (E)-2-cyanocinnamic acid are used as trisubstituted dienophiles, and their asymmetric Diels-Alder reactions with cyclopentadiene are studied. The reactions of (E)-2-cyanocinnamates of (S)-ethyl lactate and (R)-pantolactone with cyclopentadiene, catalyzed by TiCl4, allow the synthesis of enantiomerically pure cycloadducts whose absolute configurations are assigned by an X-ray diffraction study of enantiomerically pure (1S,2S,3R,4R,5R,6R)-iodolactone. The results obtained show that the alpha-cyano group influences asymmetric induction, probably through an influence on the s-cis/s-trans equilibrium of the enoate moiety of the chiral dienophile.
Stereocontrolled routes to derivatives of 3-alkoxycarbonyl-2-amino-4-aryl-5-cyano-6-phenyl-4H-pyrans
作者:Nazario Martín、Angeles Martínez-Grau、Carlos Seoane、JoséL. Marco
DOI:10.1016/0957-4166(94)00382-l
日期:1995.1
The asymmetric Michael addition of cyanoacetates 2b-e and benzoylacetonitrile 6 to alpha-benzoylcinnamonitrile 3 and alpha-cyanocinnamates 7b-e, respectively, has been studied. The resulting 3-alkoxycarbonyl-2-amino-4-aryl-5-cyano-6-phenyl-4H-pyrans 4b-e have been obtained in moderate diastereomeric excess and good chemical yield.
CATIVIELA, CARLOS;DIAZ-DE-VILLEGAS, MARIA D.;GALVEZ, JOSE A., SYNTH. COMMUN., 20,(1990) N0, C. 3145-3152
作者:CATIVIELA, CARLOS、DIAZ-DE-VILLEGAS, MARIA D.、GALVEZ, JOSE A.
DOI:——
日期:——
Cativela C., Diaz-de-Villegas M. D., Galvez J. A., An. Quim., 88 (1992) N 3, S 390-391
作者:Cativela C., Diaz-de-Villegas M. D., Galvez J. A.
DOI:——
日期:——
Cativiela, Carlos; Diaz-de-Villegas, Maria D.; Galvez, Jose A., Synthetic Communications, 1990, vol. 20, # 20, p. 3145 - 3152
作者:Cativiela, Carlos、Diaz-de-Villegas, Maria D.、Galvez, Jose A.