摘要:
A process for the preparation of 4-steroids of the formula: R1 and R2 are independently selected from the group that is hydrogen, F, Cl, Br, I, C1-6-allyl and C1-6-alkoxy, and R4 is selected from the group that is hydrogen, (N,N-di-C1-6-allylamino)methyl, allylamino)ethyl, C1-6-alkyl, C1-6-alkoxy, phenyl and benzyl, and Q7 represents a carbonyl oxygen atom or is R7-1 and R7-2, wherein one of R7-1 and R7-2 is hydrogen and the other is selected from the group that is hydrogen, F, Cl, Br, I, C1-6-alkyl and C1-6-alkoxy, and R9 represents hydrogen or F, and Q11 represents a carbonyl oxygen atom or is R11-1 and R11-2, wherein one of R11-1 and R11-2 is hydrogen and the other is selected from the group that is hydrogen, cyano, cyano-C1-3-alkyl, acetoxy, COOH and COO−M+, wherein M+ is Na+, K+ or NH+4, and R16 is selected from the group that is hydrogen, cyano, cyano-C1-3-alkyl, acetoxy, COOH and COO−M+, wherein M+ is Na+, K+ or NH+4, and COOR represents COOH or COO−M+, wherein M+ is Na+, K+ or NH+4. The three step process includes (i) a haloform reaction of a 17-acetyl steroid converting the acetyl group into a —COOR group, (ii) subsequent ozonolysis of the A-ring and (iii) reclosure of the A-ring by reaction with an appropriate nitrogen compound of formula H2NR4 to afford a compound of formula I above.
摘要:
A new procedure for the catalytic conversion of hydroxy methyl imidazoles to formyl imidazoles is described. The catalysis takes place in the presence of a peroxide. Formyl imidazoles are important intermediate products for pharmaceutical substances.
摘要:
A method for preparing pyrimidin-2-ylacetic acid esters of the general formula: ##STR1## wherein R is C.sub.1-6 -alkyl, C.sub.3-6 -cycloalkyl, aryl or arylalkyl and R.sup.1 to R.sup.3, independently of one another, are hydrogen, C.sub.1-6 -alkyl, fluorinated C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy, (C.sub.1-6 -alkoxy)-C.sub.1-6 -alkyl or (C.sub.1-6 -alkoxy)carbonyl. These esters are obtained from the corresponding 2-(halomethyl)-pyrimidine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium-phosphine complex and a base. Pyrimidin-2-ylacetic acid esters are intermediates in the preparation of herbicides.
摘要:
A five-step process for preparing 1-(6-methylpyridin-3-yl)-2-[4-methylsulfonyl)phenyl]ethanone of formula (I): The process involves the following steps: (a) 4-(methylthio)benzyl alcohol is converted into 4-(methylthio)benzyl chloride; (b) 4-(methylthio)benzyl chloride is converted with an alkali metal cyanide into 4-(methylthio)phenylacetonitrile; (c) 4-(methylthio)phenylacetonitrile is condensed with a 6-methyinicotinic ester to give 3-[2-(2-(methylthio)phenyl)-2-cyanoacetyl](6-methyl)pyridine; (d) 3-[2-(4-(methylthio)phenyl-2-cyanoacetyl](6-methyl)pyridine is hydrolyzed and decarboxylated under acidic conditions to give 3-[2-(4-(methylthio)-phenyl)acetyl](6-methyl)pyridine is hydrolyzed and decarboxylated under acidic conditions to give 3-[2-(4-(methylthio)phenyl)acetyl(6-methyl)pyridine; and (e) 3-[2(4-(methylthio)phenyl)acetyl](6-methyl)pyridine is oxidized to give the end product. The compound of formula (I) is an intermediate for preparing COX-2 inhibitors, pharmaceutically active compounds having analgesic and antiinflammatory action.
摘要:
A process for preparing 2-pyrimidinecarboxylates of the general formula: ##STR1## wherein R is C.sub.1-6 -alkyl, C.sub.3-6 -cycloalkyl, aryl or arylalkyl, and R.sup.1 to R.sup.3 are, independently of one another, hydrogen, C.sub.1-6 -alkyl, fluorinated C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy, (C.sub.1-6 -alkoxy)-C.sub.1-6 -alkyl or (C.sub.1-6 -alkoxy)carbonyl. These are obtained from the corresponding 2-halopyrimidine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium/phosphine complex and a base. 2-pyrimidinecarboxylates are intermediates for preparing herbicides.
摘要:
The process for preparing 1-(6-methylpyridin-3-yl)-2-[(4-methlsulfonyl)-phenyl]ethanone of the formula I: In a first step, 4-(methylthio)phenylacetonitrile is condensed with a 6-methylnicotinic ester to give 3-[2-(4-(methlthio)phenyl)-2-cyanoacetyl](6-methyl)pyridine of the formula II: In a second step, the compound of formula II is hydrolyzed and decarboxylated under acidic conditions using a mixture of acetic acid and a mineral acid, to give 3-[2-(4-(methylthio)phenyl)acetyl](6-methyl)pyridine of the formula III: Finally, in a last step, the compound of formula III is oxidized to give the end product.
摘要:
A novel process for the preparation of substituted pyrimidine derivatives of the general formula: ##STR1## in which a halopyrimidine is reacted in the presence of a sulfinate with a compound selected from the series: ##STR2## The compounds of the general formula I are precursors of, for example, compounds with herbicidal activity.