Oppenauer 氧化是将醇氧化为羰基化合物的一种很有前途的策略,它具有化学选择性,是有机合成中的有用工具之一。Sn-Beta 沸石在仲醇的 Oppenauer 氧化反应中作为还原剂显示出有前途和有吸引力的性能。在这项工作中,通过脱铝和 Sn 掺入的简便后合成方法成功制备了一组 Sn-Beta 催化剂。在 1-甲氧基-2-丙醇 (MOP) 选择性氧化成甲氧基丙酮 (MOA) 的过程中,研究了 Sn 含量对催化性能的影响。所获得的含 2 wt% Sn 的 2Sn-Beta 可以提供最佳性能,在 120 °C 下使用丙酮作为 H 受体时,MOP 转化率为 63.3%,MOA 产率为 58.2%(选择性为 91.9%)。基于先进的光谱表征和结构-性能相关性的结合,我们发现与其他路易斯酸对应物(例如,封闭框架 Sn 和框架外 Sn 位点)相比,开放框架 Sn 位点表现出更高的活性。我们的研究结果
New general synthesis of α-alkoxyketones via α′-alkylation, α-alkylation and α,α′-dialkylation of α-alkoxyketimines
作者:Filip Colpaert、Sven Mangelinckx、Maria Teresa Rocchetti、Norbert De Kimpe
DOI:10.1039/c0ob00662a
日期:——
important intermediates in organic synthesis and flavor compounds in food chemistry, were synthesized by deprotonation of N-(1-alkoxy-2-propylidene)isopropylamine, prepared by condensation of the corresponding α-alkoxyacetone with isopropylamine, and subsequent reaction of the corresponding 1-azaallylic anions with alkyl halides to afford α′-alkylated, α-alkylated and α,α′-dialkylated ketimines. Hydrolysis
A novel and practical preparation of the selective phosphodiesterase 10A (PDE10A) inhibitor 1 having the core moiety of a 1,3,5-trisubstituted pyridazin-4(1H)-one has been achieved. The facile preparation of 1 in 42% overall yield involves the following key features: (1) the finding that filling the headspace of the reaction vessel with Ar gas and controlling the flow rate of the gas were found to
1,1-Dichloro- and 1,3-dichloro-2-alkanones react with 2-methylfuran in the presence of lithium perchlorate/triethylamine to form 2-chloro-1-methyl-8-oxabicyclo [3.2.1]oct-6-ene-3-ones predominantly.
Ring fused pyrazole derivatives as CRF antagonists
申请人:——
公开号:US20040006066A1
公开(公告)日:2004-01-08
This invention relates to compounds which are generally CRF-1 receptor antagonists and which are represented by Formula I or Formula II:
1
wherein Ar is optionally substituted aryl or heteroaryl, R
1
-R
4
are as defined in the specification; or individual isomers, racemic or non-racemic mixtures of isomers, or pharmaceutically acceptable salts thereof. The invention further relates to processes for preparing such compounds, to pharmaceutical compositions containing such compounds, and to methods for their use as therapeutic agents.
Double addition d'organometalliques sur des nitriles α-oxygenes R1 CN. Obtention d'amines primaires de type (R1RR')CNH2
作者:R. Gauthier、G.P. Axiotis、M. Chastrette
DOI:10.1016/s0022-328x(00)89345-6
日期:1977.11
Synthesis of the amines (R1RR')CNH2 (I) was carried out by the action of two organometallic compounds RM and R'M' on the α-oxygenated nitriles R1 CN. Aliphatic and unhindered organolithium or α-ethylenic organomagnesiumcompounds must be used in the second addition. The nature of the two metallic atoms of the aminate (R1RR')CN(MM'), precursor of the amine I, has an influence on the yield of this amine