Short-lived intermediates. 8. Excited states, regioselectivity, and stereospecificity in the photochemistry of (R,S:S,R)- and (R,R:S,S)-1,2-dimethylbutyl trifluoroacetate
Short-lived intermediates. 8. Excited states, regioselectivity, and stereospecificity in the photochemistry of (R,S:S,R)- and (R,R:S,S)-1,2-dimethylbutyl trifluoroacetate
Stereochimie de quelques reactions entre aldehydes et reactifs de Grignard satures et allyliques
作者:H. Felkin、Y. Gault、G. Roussi
DOI:10.1016/s0040-4020(01)92953-9
日期:1970.1
γ-dimethylallyl magnesium bromides) and secondary alkyl [s-butyl magnesium bromide and (1,2-dimethylpropyl) magnesium chloride] Grignardreagents to form pairs of diastereoisomeric alcohols R′—CHMeCHOH—R (R′ = CH2CH, CH2CMe, Et and iPr, respectively). The reactions involving the secondary alkylGrignardreagents are not stereoselective; those involving the allylic Grignardreagents show some stereoselectivity
A novel concept for catalytic epoxide alkylation has been developed. Lewis bases like phosphanes, arsanes, stibanes, and sulfides were found to catalyze the alkylation of symmetrical epoxides with trialkylaluminum compounds very effectively at a 5 mol % level. Cyclic as well as acyclic epoxides were readily alkylated in good yields. In reactions with terminal epoxides a significant enhancement of rate
已经开发了催化环氧化物烷基化的新概念。发现路易斯碱(如磷烷、砷烷、锑和硫化物)在 5 mol% 的水平下非常有效地催化对称环氧化物与三烷基铝化合物的烷基化。环状和无环环氧化物很容易以良好的产率烷基化。在与末端环氧化物的反应中,在路易斯碱催化过程中注意到速率和/或区域选择性的显着提高。路易斯碱与路易斯酸性铝试剂的配位由 27 Al 和 31 P NMR 光谱证明,并建议形成更亲核的烷基化剂。
P2X3, RECEPTOR ANTAGONISTS FOR TREATMENT OF PAIN
申请人:Burgey Christopher S.
公开号:US20110206783A1
公开(公告)日:2011-08-25
The subject invention relates to novel P2X
3
receptor antagonists that play a critical role in treating disease states associated with pain, in particular peripheral pain, inflammatory pain, or tissue injury pain that can be treated using a P2X
3
receptor subunit modulator.