- A simple, fast and chemoselective method for the preparation of arylthiols
-
An efficient and convenient method for the synthesis of arylthiols by reaction of sulfonyl chlorides with triphenylphosphine in toluene is reported.
- Bellale, Eknath V.,Chaudhari, Mahesh K.,Akamanchi, Krishnacharya G.
-
experimental part
p. 3211 - 3213
(2010/03/01)
-
- Method of producing bis(4-alkylthiophenyl) disulfides
-
The present invention relates to a method of producing bis(4-alkylthiophenyl) disulfides characterized by (a) reducing directly a 4-alkylthiobenzenesulfonyl chloride, or (b) oxidizing a 4-alkylthiobenzenethiol obtained by reducing a 4-alkylthiobenzenesulfonyl chloride. The present invention is capable of producing the compound below useful as an intermediate of pharmaceuticals. STR1
- -
-
-
- Non-aqueous reduction of aromatic sulfonyl chlorides to thiols using a dichlorodimethylsilane-zinc-dimethylacetamide system
-
A new and efficient method for the non-aqueous reduction of sulfonyl chlorides to affored the corresponding thiols by use of a dichlorodimethylsilane-zinc-dimethylacetamide system was successfully developed. Various aromatic thiols were prepared in high yield by easy operation. Continuous reactions with the above reduction using the prepared thiol were also demonstrated.
- Uchiro, Hiromi,Kobayashi, Susumu
-
p. 3179 - 3182
(2007/10/03)
-
- SELECTIVE DEALKYLATIONS OF ARYL ALKYL ETHERS AND THIOETHERS BY SODIUM IN HMPA
-
The reaction of sodium with bis- and tris(alkoxy)benzenes in HMPA gives selectively the products of monodealkylation.The reaction proceeds through a dianion which fragments into an alkyl and an aryloxy anion.The positional selectivity of this fragmentation is governed by the structure of both the alkyl and aryloxy groups.With bis- and tris(alkoxy)benzenes which for symmetry reasons can afford aryloxy anions having the same basicity, the dealkylation involves exlusively the less substituted alkyl group.On the contrary, in the asymmetric terms, the positional selectivity of the dealkylation process is governed by the basicity of the aryloxy anion.On the basis of these concepts several efficient and synthetically useful reactions have been developed.In most cases the selectivity obtained in the present reactions in different from that observed with other previously developed methods which use sodium methoxide or sodium alkenethiolates in HMPA.It is shown that the appropriate choice of the reagent allows selective dealkylation of the desired alkoxy group of a poly(alkoxy)benzene.The reaction of sodium with bis(alkylthio)benzenes in HMPA gives the bis(mercapto)benzenes.If the reduction is carried out with a solution of sodium in HMPA, the reaction gives instead the products of monodealkylation.This however is not selective.It is suggested that in the case of thioethers the dealkylation products originate from the fragmentation of the radical anions.
- Testaferri, L.,Tiecco, M.,Tingoli, M.,Chianelli, D.,Montanucci, M.
-
p. 3687 - 3692
(2007/10/02)
-
- Substituted 2-phenyl-1,2,4-triazine-3,5(2H,4H)-diones, and coccidiostatic agents containing same
-
Novel substituted 2-phenyl-1,2,4-triazine-3,5-(2H,4H)-diones are described as well as a process for their manufacture. The novel compounds may be used as chemotherapeutics, especially as coccidiostatic agents.
- -
-
-
- Reactions of Polychlorobenzenes with Alkanethiol Anions in HMPA. A Simple, High-Yield Synthesis of Poly(alkylthio)benzenes
-
Reactions of the isomeric trichlorobenzenes and tetrachlorobenzenes and of pentachloro- and hexachlorobenzene with an excess of the sodium salt of the isopropanethiol, in HMPA, afforded the products of complete displacement of all the chlorine atoms present in the molecule.Similar substitutions were also obtained with EtSNa.The reactions with MeSNa were in some cases complicated by the competitive nucleophilic attack at the methyl group of the initially formed aryl methyl thioethers which are thus demethylated to afford thiophenols.
- Testaferri, Lorenzo,Tingoli, Marco,Tiecco, Marcello
-
p. 4376 - 4380
(2007/10/02)
-
- Indenylacetic acid compounds
-
4, 5, 6 or 7 Aryl substituted indenyl acetic acids and pharmaceutically acceptable salts, amides and esters thereof. The 4, 5, 6 or 7 aryl substituted indenyl acetic acids have anti-inflammatory, anti-pyretic and analgesic activity. The invention also includes methods for the preparation of these compounds, pharmaceutical compositions and methods of treating inflammation by administering these particular compounds to patients.
- -
-
-