selective dehydrohalogenation to form alpha-haloacrylate analogues. A variety of alpha-halo Michael acceptors were prepared in dimethyl sulfoxide under mild, base-free conditions, including the preparation of alpha-bromoacrolein and alpha-chloro- and bromoacrylonitriles. Synthesis of these molecules has been reported in the literature to be difficult. Among all the existing dehydrohalogenation procedures
The reaction of enolates of 1,3-dicarbonyl compounds with α-halo-α,β-unsaturated carbonyl compounds affords 2,4-diacyldihydrofuran derivatives in the presence of DBU in THF. Chemical manganese dioxide oxidation of the hydrofurans leads to 2,4-diacylfuran derivatives. Application of the protocol enables short-step syntheses of antitumor naphthofuran natural products.
Method for producing organic compounds by substituting halogen atoms
申请人:MITSUI CHEMICALS, INC.
公开号:EP1486479A1
公开(公告)日:2004-12-15
The invention pertains to a method in which a halogen atom of an organic compound is replaced with a group derived from a nucleophilic agent, at high yield and high efficiency, by the following method which includes a step of reacting the nucleophilic agent with an organic material having a halogen atom bonded to a carbon atom having four σ bonds, more specifically: a method for producing an organic compound having Q, the method including a step of reacting a compound represented by general formula (2) with an organic starting material having at least one halogen atom bonded to a carbon atom having four σ bonds so as to replace the halogen atom in the organic starting material with Q:
MQa (2)
(wherein M represents an alkali metal atom, an alkali earth metal atom, or a rare earth metal atom; Q represents a moiety of an inorganic acid or an active hydrogen compound derived by eliminating a proton, wherein Q is a halogen atom different from the halogen atom in the organic starting material having the halogen atom bonded to the carbon atom having the four σ bonds; and a represents an integer of 1 to 3) in the presence of a compound represented by general formula (1)
(wherein Z- represents an anion derived by eliminating a proton from an inorganic acid or an active hydrogen compound; R2 is the same or different; R2 each independently represent a C1-C10 hydrocarbon group or two R2 on the same nitrogen atom may be bonded with each other to form a ring with the nitrogen atom).
[EN] IMIDAZOLE AND TRIAZOLE DERIVATIVES USEFUL AS SELECTIVE COX-1 INHIBITORS<br/>[FR] DERIVES D'IMIDAZOLE ET DE TRIAZOLE UTILES EN TANT QU'INHIBITEURS DE COX-1 SELECTIFS
申请人:FUJISAWA PHARMACEUTICAL CO
公开号:WO2004060367A1
公开(公告)日:2004-07-22
A compound of the formula (I): or salts thereof, which are useful for treatment and/or prevention of inflammatory conditions, various pains, collagen diseases, autoimmune diseases, thrombosis, cancer or neurodengenerative diseases.
Organocatalytic stereospecific vicinal dicholorination of a wide variety of functionalized olefins such as ketoesters, esters, ketones, carvone, cholesterol and ethyl sorbate (27 examples) was achieved using inexpensive sulfuryl chloride as well as a simple phosphine catalyst under mild reaction conditions. The products were obtained with good to excellent yields and diastereoselectivities (up to 96%