The S (+) sulcatol(1) was prepared in 4 steps. Sodium phenyl sulfinate was reacted with bromoacetone in ethanol to give 1 phenylsulfonyl 2 propanone(2). Alkylation of (2) by 1 chloro 3 methyl 2 butene(3) in the presen...The S (+) sulcatol(1) was prepared in 4 steps. Sodium phenyl sulfinate was reacted with bromoacetone in ethanol to give 1 phenylsulfonyl 2 propanone(2). Alkylation of (2) by 1 chloro 3 methyl 2 butene(3) in the presence of K 2CO 3 through solid liquid PTC in DMF at 40～50 ℃ gave 3 phenylsulfonyl 6 methyl 5 heptene 2 one(4). The sulfone moiety of (4) was removed by Raney Ni reduction under mild conditions and the key intermediate prochiral 6 methyl 5 heptene 2 one(5) was obtained. Sulcatol(1) with optical purity of 94%e.e. was obtained by Baker′s yeast mediated reduction of (5).展开更多
Several polystyrene-supported selenides and selenoxide have been prepared firstly. These novel reagents were treated with LDA to produce selenium stabilized carbanions, which reacted with aldehydes and alkyl halides, ...Several polystyrene-supported selenides and selenoxide have been prepared firstly. These novel reagents were treated with LDA to produce selenium stabilized carbanions, which reacted with aldehydes and alkyl halides, followed by selenoxide syn-elimination and [2,3] sigmatropic rearrangement respectively to give Z-allylic alcohols stereoselectively.展开更多
A novel compound, named fortunate A, was isolated from the ethanol extract of the stem bark of Cryptomerica fortunei. Its structure was established on the basis of the spectral evidences including 1D and 2D NMR spectrum.
文摘The S (+) sulcatol(1) was prepared in 4 steps. Sodium phenyl sulfinate was reacted with bromoacetone in ethanol to give 1 phenylsulfonyl 2 propanone(2). Alkylation of (2) by 1 chloro 3 methyl 2 butene(3) in the presence of K 2CO 3 through solid liquid PTC in DMF at 40～50 ℃ gave 3 phenylsulfonyl 6 methyl 5 heptene 2 one(4). The sulfone moiety of (4) was removed by Raney Ni reduction under mild conditions and the key intermediate prochiral 6 methyl 5 heptene 2 one(5) was obtained. Sulcatol(1) with optical purity of 94%e.e. was obtained by Baker′s yeast mediated reduction of (5).
文摘Several polystyrene-supported selenides and selenoxide have been prepared firstly. These novel reagents were treated with LDA to produce selenium stabilized carbanions, which reacted with aldehydes and alkyl halides, followed by selenoxide syn-elimination and [2,3] sigmatropic rearrangement respectively to give Z-allylic alcohols stereoselectively.
文摘A novel compound, named fortunate A, was isolated from the ethanol extract of the stem bark of Cryptomerica fortunei. Its structure was established on the basis of the spectral evidences including 1D and 2D NMR spectrum.
