Sulfhydrolysis of Acyl Ketene Dithioacetals: A Convenient Synthesis of β-Oxodithioesters
摘要:
beta-Oxodithioesters are obtained in. good yields from acyl ketenedithioacetals on treatment with hydrogen sulphide in the presence of boron trifluoride etherate in refluxing dioxane.
Alkylation of aryl 3-oxopropanedithioate and 3-amino-1-aryl-3-thioxo-1-propanones as an effective tool for the construction of differently substituted thiophenes and annulated thiophenes
The alkylation of aryl 3-oxopropanedithioate with α-haloketones under different reaction conditions afforded substituted aryl[2-(methylsulfanyl)-4-phenyl-3-thienyl]methanones and [3-aryl-5-(methylsulfanyl)-2-thienyl](phenyl)methanones. The same strategy was extended to 3-amino-1-aryl-3-thioxo-1-propanones to afford aryl[2-amino-4-phenyl-3-thienyl]methanones and ethyl 3-phenyl-5-piperidino-2-thiophene
Stereocontrol by introduction of a sulfur functional group in the asymmetric reduction of β-ketoesters with baker's yeast; preparation of optically pure 3s-hydroxydithioesters as a new chiral synthon of natural product synthesis
Asymmetric reduction of β-ketothioester derivatives with baker's yeast produced the corresponding opticallypure 3S-hydroxyethioesters, which are useful chiral building blocks in organic synthesis. The utility of the present method was demonstrated in the stereoselectivesynthesis of sex attractant of pine saw-fly, (2S,3S,7S)-5,7-dimethylpentadec-2-yl acetate from the SS-hydroxy esters.
Highly Regioselective One-Pot, Three-Component Synthesis of 1-Aryl-3,4-Substituted/Annulated-5-(Cycloamino)/(Alkylamino)pyrazoles from β-Oxodithioesters
作者:Ganesh C. Nandi、Maya S. Singh、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1002/ejoc.201101397
日期:2012.2
An efficient, highlyregioselective protocol for the synthesis of the title compounds is reported. The reaction involves a one-pot, three-component cyclocondensation of β-oxodithioester, amine, and hydrazine in ethanol at reflux in the presence of a catalytic amount of acetic acid. Densely functionalized pyrazoles were constructed through the cyclization of a thioamide intermediate generated in situ
Reaction of β-oxodithioesters derived from acyclic and cyclic ketones with propargylamine affords novel 2-(acylalkylidene)-5-(methylene)-thiazolidines in high yields by intramolecular nucleophilic attack of thiocarbonyl sulfur on the triple bond of the β-oxo-N-propargylthioamide intermediates.
annulated benzo[a]quinolizine-4-thiones 3 has been developed. The methodology involves ring annulation of 3,4-dihydro-6,7-dimethoxy-1-methylisoquinoline 1 with a variety of readily accessible acyclic and cyclic beta-oxodithioesters 2 in the presence of triethylamine in refluxing benzene. These benzo[a]quinolizine-4-thiones can be readily converted to the corresponding benzo[a]quinolizine-4-ones 5 via dethiomethylative