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Reaction with triflic anhydride

On reaction with triflic anhydride, the mono oxides of 2,2 -bis(alkylthio)biphenyl are converted into a dithiadication (48) which spontaneously monodealkylates to give a thiasulfonium salt (49) <96TL667>. [Pg.308]

Coupling with enol esters (7, 93). A new synthesis of an alkyl-substituted alkene involves coupling of a lithium dialkyl cuprate with an enol triflate,1 available from a ketone by reaction with triflic anhydride and 2,6-di-t-butylpyridine.2 A wide variety of organocuprates can be used and the geometry of the enolate is largely retained. Reported yields are in the range 60 100%. [Pg.282]

Very simple and straightforward alkylation of NH-heterocycles (NaH, Cl(CH2) SMe, = 2 or 3, 68-86%) permits one-pot preparation of pyrrole and carbazole sulfide models for the reaction with triflic anhydride <2003S1191>. Cyclization of the (l/7-pyrrol-l-yl)alkyl sulfides 1470 obtained leads to 2,3-dihydropyrrolo[2,l- ][l,3]thiazole 1472 and 3,4-dihydro-2/7-pyrrolo[2,T ][l,3]thiazine 1473 via intermediate l-methyl-2,3-dihydropyrrolo[2,l-/ ][l,3]thiazol-1-ium or l-methyl-3,4-dihydro-27/-pyrrolo[2,T ][l,3]thiazin-Tium salts 1471 (n = Z or 3), respectively, that were isolated in high yields in most cases (Scheme 281) <2003S1191>. [Pg.246]

Related anchored l,l,3,3-tetraphenyl-2-oxa-l,3-diphospholanium bis-triflate (39) has been prepared by reaction of brominated poly(styrene-co-divinylbenzene) resin 38 with the phosphorous anion generated from l,2-bis(diphenylphosphino)ethane and sodium naphthalenide followed by further oxidation and reaction with triflic anhydride (Scheme 7.13) [55]. This supported reagent has also been employed, to a lesser extent than 37, for the formation of esters and amides by reaction of carboxylic acids with primary alcohols and amines, respectively. [Pg.151]

Carbohydrate triflates. Triflates of carbohydrates can be prepared in high yield by reaction with triflic anhydride. Thus the reaction of (1), l,2 5,6-di-O-isopropylidene-a-D-allofuranose, with triflic anhydride in pyridine at -15° gives the triflate (2) in 80% yield. When (1) is refluxed with triflic anhydride in... [Pg.620]

Nitriles. Aldoximes are dehydrated to nitriles by reaction with triflic anhydride and triethylamine in CH2CI2 at — 78 20° (equation I). ... [Pg.199]

Treatment of methyl 2-deoxy-3-D-e/> l /(ro-pentopyranoade with /-butyldiphenylsilyl chloride in the presence of silver nitrate followed by reaction with triflic anhydride gave methyl 3-d-Tbdms-2,4,5-trideoxy-a-D-g/ cero-pent-4-enopyranoside which on further reaction with /-butyllithium then tributyltin chloride affords stann ated glycal 17. In a similar way methyl 2-dtoxy-a-L-erythro-... [Pg.172]

Scheme 6.10 Synthesis of triflate-initiators from the corresponding alcohols by reaction with triflic anhydride in the presence of 2,6-di-tert-butyl pyridine as proton trap. Scheme 6.10 Synthesis of triflate-initiators from the corresponding alcohols by reaction with triflic anhydride in the presence of 2,6-di-tert-butyl pyridine as proton trap.

See other pages where Reaction with triflic anhydride is mentioned: [Pg.148]    [Pg.204]    [Pg.328]    [Pg.330]    [Pg.103]    [Pg.123]    [Pg.66]    [Pg.204]    [Pg.485]    [Pg.248]    [Pg.232]    [Pg.174]    [Pg.352]    [Pg.50]    [Pg.112]    [Pg.569]   
See also in sourсe #XX -- [ Pg.493 ]




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Anhydrides reactions

Reaction with anhydrides

Triflic anhydride

Triflic anhydride reaction with alcohols

With anhydrides

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