摘要:
Disclosed is a method for commercially advantageously producing 2-isopropenyl-5-methyl-4-hexen-1-yl 3-methyl-2-butenoate with high yield. Specifically disclosed is a method for producing 2-isopropenyl-5-methyl-4-hexen-1-yl 3-methyl-2-butenoate represented by the formula (IV) below which is characterized in that a sulfonate compound represented by the general formula (III) below is obtained by reacting 2-isopropenyl-5-methyl-4-hexen-1-ol with an organic sulfonyl halide in the presence of a basic substance, and then the thus-obtained sulfonate compound is reacted with a senecioic acid in the presence of a basic substance. (In the formula, R represents a hydrocarbon group.)
摘要:
The invention provides a process for preparing 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives under mild conditions in high yield with industrial advantage. The invention relates to a process for the preparation of 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives of the general formula (III) or (IV), characterized by reacting an α,β-unsaturated carboxylic acid (I) with a furan derivative (II) in the presence of a Lewis acid.
摘要:
A process for preparing 7-azabicyclo[4.1.0]hept-3-ene-3-carboxylic acid esters (VII) inexpensively, industrially advantageously, efficiently and on a large scale. This process is characterized by comprising reacting an epoxide (I) with an amine (II) to obtain an aminodiol (III), reacting this aminodiol (III) with a sulfonylating agent in the presence of a base to obtain an azabicyclohept-2-ene (IV), reacting the obtained compound (IV) with an alcohol (V) in the presence of a Lewis acid to obtain an azabicyclohept-3-ene (VI), and eliminating the 7-position substituent, R2, from the azabicyclohept-3-ene (VI).
摘要:
A process for producing (5a,7a)-3-spiro-2'-(1',3'-dioxolan)-24-oxocholest-22-en-7-yl benzoate (unsaturated ketone (I)), which is represented by the formula (I), (I) characterized by dissolving in methanol a crude reaction product which contains the unsaturated ketone (I) and has been obtained in a reaction step, the amount by mass of the methanol being 1.5-3 times the amount by mass of the unsaturated ketone (I) contained, to obtain a solution, adding the solution to water, the amount by mass of the water being 5-30 times the amount by mass of the unsaturated ketone (I) contained, to thereby obtain a suspension containing the unsaturated ketone (I) which has been solidified, separating the solid from the suspension, and drying the solid obtained. The unsaturated ketone (I) obtained is useful as an intermediate for squalamine, which has potent antibacterial activity and anticancer activity.
摘要:
A process for preparation of cyclopropylethanol which comprises subjecting a 3-cyclopropyl-2,3-epoxypropionic ester to solvolysis, treating the obtained product with an acid to form cyclopropylacetaldehyde, and reducing this aldehyde; and a process for preparation of cyclopropylacetonitrile which comprises reacting cyclopropylacetaldehyde obtained in the above process with hydroxylamine or a salt thereof to form cyclopropaneacetaldehyde oxime and reacting this oxime with acetic anhydride. According to the present invention, cyclopropylethanol or cyclopropylacetonitrile can be industrially advantageously prepared at a low cost.
摘要:
A process for industrially advantageously and easily producing a cyclopropane monoacetal derivative represented by the general formula (III) through a small number of steps, characterized by reacting a halogenated unsaturated carbonyl compound represented by the general formula (II) with an alcoholate. (In the formulae, the symbols are the same as defined in the description.)