Magnesium monoperoxyphthalate,

Three peroxyacids are produced commercially for the merchant market peroxyacetic acid as a 40 wt % solution in acetic acid, y -chloroperoxybenzoic acid, and magnesium monoperoxyphthalate hexahydrate. Other peroxyacids are produced for captive use, eg, peroxyformic acid generated in situ as an epoxidizing agent. 

MMPP-6H20 (magnesium monoperoxyphthalate), pH 7 buffer, MeOH, 0°, 5-120 min, 76-99% yield. These conditions were used to cleave the related SAMP hydrazone in the presence of two trisubstitued alkenes in 46% yield. ... 

Many other reagents for converting alkenes to epoxides,including H2O2 and Oxone , VO(0-isopropyl)3 in liquid C02, ° polymer-supported cobalt (II) acetate and 02, ° and dimethyl dioxirane.This reagent is rather versatile, and converts methylene oxiranes to spiro-epoxides. ° ° One problem with dimethyloxirane is C—H insertion reactions rather than epoxidation. Magnesium monoperoxyphthalate is commercially available, and has been shown to be a good substitute for m-chloroperoxybenzoic acid in a number of reactions. 

It is possible to oxidize dimethylhydrazones R—C=N—NMe2 to the corresponding nitrile (R—C=N) with MeRe03/H202 magnesium monoperoxyphthalate... 

Pyrazolo[l,2-r-][l,3,4]oxadiazine derivative 188 is converted to the corresponding (V-oxide 189 by oxidation with magnesium monoperoxyphthalate (MMPP) or -chloroperbenzoic acid (MCPBA) (Equation 23) <2004CEJ737>. 

Dg]-butadiene monoepoxide, 8, has been synthesized2 by treating the water solution (pH 5.5) of magnesium monoperoxyphthalate hexahydrate at room temperature with [Dg]-1,3-butadiene at 1 atmosphere in 94% yield after 50 min reaction time. Under these conditions less than 1% of butadiene diepoxide has been formed as determined by GC/MS. The concentration of the [Dg]-butadiene monoepoxide in the aqueous reaction mixture at various reaction times has been determined by selective ion monitoring of ions with mjz... 

Alternatively, Ballini devised a new strategy to synthesize tri-alkylated pyrroles from 2,5-dialkylfurans and nitroalkanes <00SL391>. This method involves initial oxidation of 2,5-dimethylfuran with magnesium monoperoxyphthalate to cA-3-hexen-2,5-dione (6). Conjugate addition of the nitronate anion derived from the nitro compound 7 to 6 followed by chemoselective hydrogenation of the C-C double bond of the resulting enones 8 (obtained by elimination of nitrous acid from the Michael adduct) completes the conversion to the alkylated y-diketones 9. Final cyclization to pyrroles 10 featured improved Paal-Knorr reaction conditions involving reaction of the diketones with primary amines in a bed of basic alumina in the absence of solvent. 

A general oxidative cleavage reaction of ketone-derived SAMP-hydrazones can be realized without racemization by reaction with magnesium monoperoxyphthalate (MMPP) hexahydrate in methanol or in methanol/pH 7 phosphate buffer within 2 hours26. 

Alkylated Ketones by Cleavage of Alkylated SAMP-Hydrazones General Procedure for Oxidation with Magnesium Monoperoxyphthalate Hexahydrate2 ... 

A solution of 5 mmol of the hydrazone in 5 mL of methanol is added dropwise to 6 mmol of magnesium monoperoxyphthalate hexahydrate suspended in 40 mL of a mixture of methanol and pH 7 phosphate buffer solution (1 1) at 0°C. The reaction mixture is stirred at 0"C until the hydrazone has completely reacted (monitored by TLC). 150mL of diethyl ether and 10 mL of water are added, and the organic layer is separated and washed with lOmL of sat. aq NaHC03,10 mL of water and 10 mL of brine. The ethereal solution is dried over MgS04 and concentrated at reduced pressure. The crude product is purified by Kugelrohr distillation or flash chromatography to afford the alkylated ketones in 76 99% yield without any racemization. 

Moreover, reaction of 6,6-dimethylbicyclo[3.1, l]heptan-2-one with an aqueous suspension of magnesium monoperoxyphthalate at 80 °C gave 7,7-dimethyl-2-oxabicyclo[4.1.1]octan-3-one in only 0.5 % yield,24... 

After optical resolution by lipase, the silylated furanol with a trifluoromethyl group, was converted into the corresponding butenolide by oxidation with magnesium monoperoxyphthalate (MMPP). Ring opening of this butenolide... 

In the original patent published by Merck in 1995, rofecoxib (2) was synthesized in three steps from the known 4-(methylthio)acetophenone (10), prepared from the Friedel-Crafts acylation of thioanisole. As depicted in Scheme 2, oxidation of sulfide 10 using an excess of magnesium monoperoxyphthalate hexahydrate (MMPP, an inexpensive, safe and commercially available surrogate for w-CPBA) gave rise to sulfone 11, which was subsequently brominated with bromine and AICI3 to afford 2-bromo-l-(4-(methylsulfonyl)phenyl)ethanone (12). After recrystallization from 1 1 EtOAc/hexane, the pure phenylacyl bromide 12 was then cyclo-condensed with phenylacetic acid under the influence of l,8-diazabicyclo[5.4.0]undec-7-ene (DBU) to deliver rofecoxib (2) in... 

The synthesis of rofecoxib can be achieved by several different routes (Drugs Fut., 1998). A highly efficient synthesis for rofecoxib was recently described (Therien et al., 2001). As illustrated in Scheme 79, acetophenon (i) is prepared according to the literature, by Friedel-Crafts acylation with thioanisole. Oxidation with MMPP (magnesium monoperoxyphthalate hexahydrate) affords the sulfone (ii), which is reacted with bromine in chloroform in the presence of a trace amount of AICI3, to give (iii). Bromoketone (iii) is than coupled and cyclized in a second step, one-pot procedure with phenylacetic acid. Firstly, the mixture of bromoacetophenone (iii) and phenylacetic acid in acetonitrile is treated with... 

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