Synthesis and diels alder reactions of (+)-(S)-1-t-Butylsulfonyl-1-p-tolylsulfinylethene, a new masked chiral ketene equivalent
作者:Rosa López、Juan Carlos Carretero
DOI:10.1016/s0957-4166(00)80525-x
日期:1991.1
Enantionmerically pure (+)-(S)s-1-t-butylsulfonyl-1-1-p-tolylsulfinyllethene (1) was easily prepared in three steps from t-butyl methylsulfone. The catalyzed Diels-Alder reactions of 1 with cyclopentadiene were highly stereoselective. The major adduct was transformed into (+)-(1R, 4S)-2-t-butylsulfonyl1-2,5-nobornadiene.
The visible-light mediated oxidative C–C bond cleavage of aldehydes has been achieved in good yields at ambient temperature and open to air using Ru(bpy)3Cl2 (bpy = 2,2′-bipyridine) as the photoredox catalyst. Moreover, we further demonstrated the application in a tandem Michael/oxidative C–C bond cleavage reaction.
A vinylcyclobutane substrate designed as a cyclopropylcarbinyl radical probe
作者:Phyllis A. Leber、Ryan M. Bell、Carlton W. Christie、Joseph A. Mohrbacher III
DOI:10.1039/c3ob00033h
日期:——
Appending a spirocyclopropane linkage to bicyclo[3.2.0]hept-2-ene is achieved by selective kinetic cyclopropanation of 6-methylenebicyclo[3.2.0]hept-2-ene. The resultant vinylcyclobutane undergoes [1,3] migration as the dominant thermal process. A minor cyclopropylcarbinyl (CPC) rearrangement product clearly implicates a diradical transition structure. The presence and absence of other potential thermal
Enantiomers of cis- and trans-3-(4-propyl-cyclopent-2-enyl) propyl acetate. A study on the bioactive conformation and chiral recognition of a moth sex pheromone component
作者:Anna-Lena Gustavsson、Mattias C. Larsson、Bill S. Hansson、Tommy Liljefors
DOI:10.1016/s0968-0896(97)00162-4
日期:1997.12
constrained analogues of (Z)-5-decenyl acetate (1), a sex pheromonecomponent of the turnipmoth, Agrotissegetum, have been synthesized and tested using the electrophysiological single-sensillum technique. The analogues mimic a cisoid and transoid conformation of 1, respectively. In addition, the enantiomers of each of the cis- and trans-isomers are conformationally constrained analogues of enantiomeric
Stereospecific Synthesis of Carbanucleotides Designed for Antisense Methodology
作者:Xue-Feng Zhu、Freddy Nydegger、Albert Gossauer
DOI:10.1002/hlca.200490202
日期:2004.9
A shortstereospecificsynthesis of the carbocyclic 2′-deoxynucleoside analogues 36 and 37 (Schemes 2 and 5) and 45 and 46 (Schemes 2 and 6) starting from optically active 8,9,10-trinorborn-5-en-2-one (1) is described. As two functional groups capable to react with each other are present in the same molecule of the synthetic carbanucleosides, the latter can form polymers similar to oligonucleotides