construction of carbon–sulfur bonds has been achieved via halogen-free Cs2CO3-promoted cross dehydrogenative coupling (CDC) of thiophenols with acetonitrile. This transformation provides a straightforward route to the synthesis of sulfenylated acetonitriles in up to 80% yield.
通过无卤的Cs 2 CO 3促进的硫酚与乙腈的交叉脱氢偶联(CDC),实现了构建碳-硫键的新方法。这种转化为亚磺酰化乙腈的合成提供了一条简单的途径,产率高达80%。
Control of diastereoselectivity in the nucleophilic epoxidation of 1-arylthro-1-nitroalkenes: synthesis of diastereoisomerically pure γ-hydroxy threonine derivatives
作者:Richard F. W. Jackson、Joanna M. Kirk、Nicholas J. Palmer、David Waterson、Martin J. Wythes
DOI:10.1039/c39930000889
日期:——
Epoxidation of the 1-nitro-1-(p-tolylthio)alkene 1 derived from D-isopropylideneglyceraldehyde with lithium tert-butyl peroxide affords the syn epoxide 2 with moderate selectivity, whereas epoxidation with potassium tert-butyl peroxide affords the anti diastereoisomer 3 preferentially; treatment of each of the epoxides 2 and 3 with amines, including ammonia, gives diastereoisomerically pure α-amino thioesters with no trace of stereoisomeric contamination.
The sulfenylation of nitroalkanes and hydroxyaryls in DMSO using aryldisulfides as sulfenylating reagents was studied. The corresponding arylthionitroalkanes and arylthiohydroxyaryls were obtained in moderate to good yields in very mild conditions, thus improving the reported procedures for the synthesis of these compounds.
Stereoselective Synthesis of Differentially Protected anti-α,β-Diamino Acid Derivatives using Arylthionitrooxiranes
作者:Estelle Dumez、Andrea Szeki、Richard F. W. Jackson
DOI:10.1055/s-2001-16047
日期:——
Epoxidation of 1-tolylthio-1-nitroalkenes containing an allylic Z- or Fmoc-protected amino group yields the corresponding syn-epoxides which, although they cannot be isolated, can be trapped with aqueous ammonia to give stereoisomerically pure anti-α,β-diamino acid derivatives.
Stereoselective synthesis of anti-β-amino-α-hydroxy acid derivatives using nucleophilic epoxidation of 1-arylthio-1-nitroalkenes
作者:Lydia Ambroise、Richard F.W Jackson
DOI:10.1016/0040-4039(96)00252-3
日期:1996.3
Reaction of lithium t-butylperoxide with 1-arylthio-1-nitroalkenes 5, prepared by condensation of (4-tolylthio)nitromethane with N-(Boc)-protected α-amino aldehydes, leads to the formation of oxazolidinones rather than the expected oxiranes. Initially, a mixture of cis 8 and trans 9 diastereoisomers is formed, but upon exposure to silica gel complete conversion to the cis-diastereoisomers 8 takes place