- A 2-benzyl-furan-4-methanol synthesis method
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The invention discloses a method for synthesizing 2-benzyl furan-4-methanol. The method comprises the following steps: (1) reacting a hydroxyl protecting agent with 4-hydroxymethyl furan-2-formaldehyde, so as to obtain a compound of which the structure is shown in a formula a; (2) mixing a phenyl carbon anion reagent with a compound of which the structure is shown in the formula a, and reacting to obtain a compound of which the structure is shown in a formula b; (3) removing a hydroxyl protection groups from the compound of which the structure is shown in the formula b, and then carrying out hydrogenolysis, thereby obtaining the 2-benzyl furan-4-methanol.
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- Synthesis of substituted 3-furanoates from MBH-acetates of acetylenic aldehydes via tandem isomerization-deacetylation-cycloisomerization: Access to Elliott's alcohol
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A new method for the synthesis of 5-substituted furan-3-carboxylates from Morita-Baylis-Hillman acetates of acetylenic aldehydes is reported. The process involves palladium-catalyzed isomerization followed by base-promoted deacetylation and cycloisomerization reactions. The utility of this chemistry is further demonstrated by the synthesis of Elliott's alcohol, a key intermediate of the pyrethroid resmethrins. This journal is The Royal Society of Chemistry 2014.
- Reddy, Chada Raji,Krishna, Gaddam,Reddy, Motatipally Damoder
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p. 1664 - 1670
(2014/03/21)
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- Isoxazolines as intermediates to furans
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Isoxazolines of the general formula II STR1 in which R1, R2, R3 and R4 are each unsubstituted or halogen-, haloalkyl-, alkoxy-, haloalkoxy-, nitro-, cyano-, dialkylphosphonyl- or alkoxycarbonyl-substituted alkyl, aryl, aralkyl, alkoxycarbonyl or dialkoxyphosphonyl, R2 and R4 are each also hydrogen and R3 is also hydroxyalkyl which is unblocked or blocked by a detachable protective group or is haloalkyl, X is hydrogen or a detachable protective group, are used to prepare furans.
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- Pyrimidine substituted-2,2-dimethylcyclopropane carboxylates useful for combating insect and acarine pests at a locus
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A compound of formula: STR1 wherein R2 represents an α-branched alkyl group containing from 3 to 6 carbon atoms, and R represents either (a) hydroxy, halo or alkoxy of up to six carbon atoms, or (b) the group --OR1 where R1 is the residue of an alcohol of formula R1 OH which forms an insecticidal ester with chrysanthemic acid, permethrin acid or cyhalothrin acid. The compounds have insecticidal and acaricidal properties.
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- Pentafluorobenzyl esters
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The (+), (-) and (±) forms of the compounds of the general formula (I) STR1 characterized in that R1 is a halo group; or a lower alkyl, lower alkoxy or lower alkylthio group, each of which may be substituted with one or more halo groups; R2 is hydrogen or a methyl group; or R1 and R2 together form a methylenedioxy, or a difluoromethylenedioxy group or, with the carbon atoms to which they are attached, an aromatic or heteroaromatic ring; and A is one of the groups X or Y STR2 wherein X1 and X2 are the same or different and each is hydrogen or a fluoro, chloro, bromo or methyl group, with the proviso that if X1 is a fluoro group, then X2 should not be a bromo group; and X3 and X4 are the same or different and each is hydrogen or a fluoro group; and Y1, Y2, Y3, Y4, Y5 and Y6 are the same or different groups and each is hydrogen or a fluoro, bromo, chloro, or methyl group. The compounds (I) are insecticidally active.
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