α-Diazosulphones and related compounds from the base-induced cleavage of α-diazo-β-ketosulphones
作者:D. Hodson、G. Holt、D. K. Wall
DOI:10.1039/j39680002201
日期:——
sulphonylformaldehyde hydrazones (70—80%), a previously unknown class of compounds, which arose by hydrolysis of the first formed phosphazine. The acylsulphonyldiazomethanes were prepared by the action of toluene-p-sulphonylazide and triethylamine on β-ketosulphones in 60% aqueous ethanol. If the diazoketosulphone is retained in solution and the reaction period prolonged, sulphonylformaldehyde hydrazones may be
An aryl thiol–vinyl azide coupling reaction and a thiol–vinyl azide coupling/cyclization cascade: efficient synthesis of β-ketosulfides and arene-fused 5-methylene-2-pyrrolidinone derivatives
The addition reaction of thiol to vinyl azide has been extensively studied. Variously substituted aryl thiols are all viable for this coupling process. The scope of the other partner is successfully expanded from α-aryl vinyl azide to α-alkyl vinyl azide. A thiol–vinyl azide coupling/cyclization cascade is realized with substituted aryl vinyl azides carrying a 2-methoxycarbonyl group. The value of
Catalyst-Free Insertion of Sulfoxonium Ylides into Aryl Thiols. A Direct Preparation of β-Keto Thioethers
作者:Rafael M. P. Dias、Antonio C. B. Burtoloso
DOI:10.1021/acs.orglett.6b01470
日期:2016.6.17
Insertion of sulfoxoniumylides into the S–H bond of aryl thiols without the need for a catalyst is demonstrated, furnishing β-keto thioethers in excellent yield in most cases. The method overcomes traditional syntheses that employ metal catalysts in combination with diazo compounds or toxic and hard-prepared haloketones. The experimental setup consists of mixing the reagents in acetonitrile at room
Sulfite-Promoted One-Pot Synthesis of Sulfides by Reaction of Aryl Disulfides with Alkyl Halides
作者:Ping Zhong、Ri-yuan Tang、Qiu-lian Lin
DOI:10.1055/s-2006-950363
日期:2007.1
dithionite, sodium thiosulfate and rongalite promoted one-pot synthesis of aryl alkylsulfides at room temperature has been developed. The reactions of a range of disulfides with alkyl halides proceeded smoothly in the presence of rongalite. Possible reaction pathways are discussed and the effects of these sulfites on disulfides are investigated. The important features of this protocol are metal-free, strong-base-free
Regioselective Synthesis of 5-(Arylsulfanyl)- and 5-(Benzylsulfanyl)-6-phenylsalicylates by One-Pot Cyclizations of 1,3-Bis(silyloxy)buta-1,3-dienes with 2-(Arylsulfanyl)- and 5-(Benzylsulfanyl)-3-ethoxy-1-phenylprop-2-en-1-ones
5‐(Arylsulfanyl)‐6‐phenylsalicylates were prepared by one‐pot cyclizations of 1,3‐bis(trimethylsilyloxy)buta‐1,3‐dienes with 2‐(arylsulfanyl)‐3‐ethoxy‐1‐phenylprop‐2‐en‐1‐ones.