Highly Stereocontrolled Synthesis of <i>trans</i>-2,6-Disubstituted-5-methyl-3,6-dihydropyrans: Stereoselective Synthesis of the Bicyclic Core of Penostatin B
作者:D. Srinivas Reddy、Birakishore Padhi、Debendra K. Mohapatra
DOI:10.1021/jo502101u
日期:2015.2.6
An efficient, mild, and highlydiastereoselective strategy for the synthesis of trans-2,6-disubstituted-5-methyl-3,6-dihydropyran ring systems has been developed starting from δ-hydroxy α-methyl α,β-unsaturated aldehydes and allyltrimethylsilane in the presence of a catalytic amount of ZnBr2 in a highlydiastereoselective manner with excellent yield. The versatility of the above method was also demonstrated
Disclosed herein are therapeutic agents and/or preventive agents for pain or therapeutic agents and/or preventive agents for a sodium channel associated disease. The present invention provides compounds represented by the following formula (I) or pharmacologically acceptable salts thereof:
The present invention relates to a medicament for treating or preventing a disease related to orexin receptor, especially orexin type 2 receptor, comprising a new compound having a urea structure or a pharmaceutically acceptable salt thereof as an active ingredient. In more detail, the present invention relates to a medicament for treating or preventing narcolepsy, idiopathic hypersomnia, hypersomnia, sleep apnea syndrome, etc.
Regiochemical Control of the Ring Opening of 1,2-Epoxides by Means of Chelating Processes. Part 14: Regioselectivity of the Opening Reactions with MeOH of Remote O-Substituted 1,2-Epoxycyclohexanes under Gas-Phase Operating Conditions
作者:Paolo Crotti、Valeria Di Bussolo、Lucilla Favero、Mauro Pineschi、Francesco Marianucci、Gabriele Renzi、Giuseppina Amici、Graziella Roselli
DOI:10.1016/s0040-4020(00)00643-8
日期:2000.9
was determined in the gas-phase in opening reactions with MeOH, using a gaseous acid (D3+, CnH5+, Me2F+) as the promoting agent. The results obtained indicate the incursion in the opening process in the gasphase of H+(or D+)-mediated chelated bidentate species completely absent in the corresponding reactions (methanolysis) carried out in the condensedphase.
使用气态酸(D 3 +,C n H 5 +,Me 2 F +)作为促进剂,在与MeOH进行开环反应的气相中,确定了具有远距离O-官能度的环己烯氧化物的区域化学行为。所获得的结果表明,在缩合相中进行的相应反应(甲烷分解)中完全不存在H +(或D +)介导的螯合双齿物质在气相中的打开过程。
Syn-stereoselective epoxidation of allylic ethers using CF3CO3H.
作者:Brian A. McKittrick、Bruce Ganem
DOI:10.1016/s0040-4039(00)94979-7
日期:1985.1
Good -stereoselectivity is observed in the epoxidation of allylic silyl ethers with CF3CO3H, indicating a new type of hydrogen-bonded transition state.
在CF 3 CO 3 H与烯丙基甲硅烷基醚的环氧化中观察到良好的立体选择性,这表明是新型的氢键合过渡态。