Abstract: The present invention relates to a process for production of a steroid compound having a partial structure represented by Formula (2) by oxidizing a steroid compound having a partial structure represented by Formula (1), without the need of any special apparatus, in a safe and economical manner, with less adverse affect on environment, in a simple and high efficient manner. Specifically, the invention relates to a process for producing a steroid compound having a partial structure of ring A and ring B of the steroid skeleton represented by Formula (2): wherein R represents a hydrogen atom or C1-6 alkyl group, comprising the step of reacting a steroid compound having a partial structure of ring A and ring B of the steroid skeleton represented by Formula (1): wherein R is the same as above; with a catalytic amount of copper halide in the presence of oxygen.

Abstract: The present invention relates to a process for production of a steroid compound having a partial structure represented by Formula (2) by oxidizing a steroid compound having a partial structure represented by Formula (1), without the need of any special apparatus, in a safe and economical manner, with less adverse affect on environment, in a simple and high efficient manner. Specifically, the invention relates to a process for producing a steroid compound having a partial structure of ring A and ring B of the steroid skeleton represented by Formula (2): wherein R represents a hydrogen atom or C1-6 alkyl group, comprising the step of reacting a steroid compound having a partial structure of ring A and ring B of the steroid skeleton represented by Formula (1): wherein R is the same as above; with a catalytic amount of copper halide in the presence of oxygen.

Abstract: This invention relates to: (1) a compound represented by the formula (V), its tautomer and a mixture of the same; (2) a process for producing the compound represented by the above-mentioned formula (V), its tautomer or a mixture of the same, which comprises reacting N-vinylpiperidone represented by the formula (I) with a nicotinate represented by the formula (II), wherein R represents a lower alkyl group, in the presence of a sodium alkoxide; (3) a process for producing a pyridine derivative represented by the formula (III), which comprises producing the compound represented by the formula (V), its tautomer or a mixture of the same by the process as described in the above (2), and then treating the obtained compound with an acid; and (4) a process for producing a pyridine derivative represented by the formula (IV), in which the treatment with an acid as described in the above (3) is followed by another treatment with a base.

Abstract: A pyrido[1,2-a]pyrimidine derivative which is useful as an antiallergic agent can be produced from a 2-aminopyridine derivative or a hydrazoic acid salt thereof by a one-pot and substantially one-step process.

Abstract: 4-Halogeno-2-alkoxyimino-3-oxo fatty acid can be produced by one-pot and one-step by reacting a halogenating agent with a 2-alkoxyimino-3-oxo fatty acid ester in an ether solvent or a mixed solvent of an ether solvent and an inert organic solvent such as carbon tetrachloride, benzene, toluene, etc.