Nitro compounds are converted into the corresponding carbonyl compounds by treatment with base and MoO5·Pyr·HMPA.
通过用碱和MoO 5 ·Pyr·HMPA处理将硝基化合物转化为相应的羰基化合物。
Cu−Catalyzed Enantioselective Conjugate Addition of Alkylzincs to Cyclic Nitroalkenes: Catalytic Asymmetric Synthesis of Cyclic α-Substituted Ketones
作者:Courtney A. Luchaco-Cullis、Amir H. Hoveyda
DOI:10.1021/ja020605q
日期:2002.7.1
highly enantioselective (>/=92% ee) catalytic method for conjugate addition of alkylzinc reagents to cyclic nitroalkenes is reported. Reactions are promoted in the presence of 0.5-5 mol % (CuOTf)2.C6H6 and 1-10 mol % of chiral amino acid-based phosphine ligands at 0 degrees C in toluene. The Cu-catalyzed reactions can be effectively carried out with small-, medium-, and large-ring nitroalkenes. Depending
The present invention provides a compound having an ACC inhibitory action, which is useful as an agent for the prophylaxis or treatment of obesity, diabetes and the like, and having superior efficacy.
The present invention relates to a compound represented by the formula (I):
wherein each symbol is as defined in the specification, or a salt thereof.
Process for preparing modified diene polymer rubbers
申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0270071A2
公开(公告)日:1988-06-08
A process for preparing modified diene polymer rubbers having an increased impact resilience and a reduced hardness at low temperatures and useful as rubber materials for automobile tires and other industries which comprises producing an alkali metal-containing conjugated diene polymer, and reacting the alkali metal-containing polymer with a modifier selected from the group consisting of a nitro compound, a phosphoryl chloride compound of the formula:
wherein R¹ to R⁴ are independently an alkyl group, and an aminosilane compound of the formula:
wherein R⁵ to R⁷ are independently an alkyl group or an alkoxyl group, R⁸ and R⁹ are independently an alkyl group, and n is an integer,
said alkali metal-containing diene polymer being prepared by a living anionic polymerization using an alkali metal-based catalyst or by an addition reaction of a diene polymer having conjugated diene units and an alkali metal-based catalyst in a hydrocarbon solvent. The modified diene polymers can be incorporated with usual rubber additives to provide rubber compositions for various purposes, and the cured products show an increased impact resilience and a reduced hardness at low temperatures.