Chiral sulfur compounds. 9. Stereochemistry of the intermolecular and intramolecular conjugate additions of amines and anions to chiral (E)- and (Z)-vinyl sulfoxides. Total syntheses of (R)-(+)-carnegine and (+)- and (-)-sedamine
Studies on Intramolecular Alkylation of an α-Sulfinyl Vinylic Carbanion: a Novel Route to Chiral 1-Cycloalkenyl Sulfoxides
作者:N Maezaki
DOI:10.1016/s0040-4020(00)00713-4
日期:2000.9.29
investigated. Upon treatment with LDA in THF at −78°C, α-sulfinylcarbanion generated from vinylic sulfoxides cyclized at the α-sulfinyl position to give 1-cycloalkenyl sulfoxides with a five- to seven-membered ring. Although iodide or bromide is normally a good leaving group, chloride affords better results than the corresponding iodide and bromide when the reaction takes place at the benzylic position. The cyclization
α-Phosphoryl sulfoxides. XI. Sulfenylation of α-phosphoryl sulfoxides and a general synthesis of optically active ketene dithioacetal mono-S-oxides
作者:Marian Mikołajczyk、Wanda H. Midura、Blanka Wladislaw、Francisco C. Biaggio、Liliana Marzorati、MichałW. Wieczorek、Jarosław Błaszczyk
DOI:10.1016/s0040-4020(96)01175-1
日期:1997.2
α-phosphoryl sulfoxides 1 with S-methyl methanethiosulfonate and phenylselenenyl bromide, respectively, affording α-methylsulfenyl- and α-phenylselenenyl-α-phosphoryl sulfoxides 8 and 9 are described. Sulfenylation of (+)-(S)-dimethoxyphosphorylmethyl p-tolyl sulfoxide 2 gave a mixture of opticallyactive diastereoisomers of the sulfoxide 8a which is a key substrate in the Horner-Wittig synthesis of enantiomeric
Intramolecular addition of amines to chiral vinyl sulfoxides, total synthesis of ()-(+)-canadine
作者:Stephen G. Pyne
DOI:10.1016/s0040-4039(00)96613-9
日期:1987.1
The intramolecular conjugate addition of an amine to the chiral vinyl sulfoxides and to give chiral isoquinolines and is reported. Isoquinoline is converted to ()-(+)-Canadine via an intramolecular Pummerer reaction.