Organic photochemistry. 43. Stereoselective addition of singlet oxygen to 7-isopropylidenenorbornene derivatives. Possibility of .pi.-orbital distortion in the homoconjugated system
Rh-Catalyzed Highly Enantioselective Hydroalkynylation Reaction of Norbornadiene Derivatives
作者:Baomin Fan、Jianbin Xu、Qingjing Yang、Sifeng Li、Hualei Chen、Shanshan Liu、Lu Yu、Yongyun Zhou、Lin Wang
DOI:10.1021/ol402804t
日期:2013.12.6
The complexes of various Rh precusors with ferrocenyl chiral ligand (R,S)-Cy2PF-PPh2 were found effective catalysts for the asymmetrichydroalkynylation reaction of norbornadiene derivatives. When RhCl3·3H2O was employed, good yields (up to 98%) and high enantioselectivities (up to >99.9% ee) could be obtained for the reactions of a broad scope of substrates.
Site selectivity in the reactions of 1,3-dipoles with norbornadiene derivatives
作者:D. Cristina、M. De Amici、C. De Micheli、R. Gandolfi
DOI:10.1016/s0040-4020(01)92451-2
日期:1981.1
2-diazopropane and C-pnenyl-N-methyl-nitrone react with the sole tetrasubstituted double bond of 1a–c in stereo- and site-specific cycloadditions. The quantitative evaluation of the two possible reaction paths was performed by glc analysis. The compounds detected were those arising from Diels-Alder cycloreversions of the thermally labile intermediate adducts 2 and 3 (Scheme 1). The results were rationalized
Participation of Non-Conjugated Double Bonds inDiels-Alder Reactions. A kinetic study of the addition of tropone to norbornens
作者:H. R. Pfaendler、Hiroshi Tanida、Edwin Haselbach
DOI:10.1002/hlca.19740570213
日期:——
A kinetic study of Diels-Alder additions between norbornene derivatives acting as dienophiles and the dienes tropone, perchlorocyclopentadiene and 9,10-dimethylanthracene is presented. The results suggest that tropone thereby acts as an electron acceptor, classifying these reactions then as Diels-Alder additions with ‘inverse electron demand’.