(p-Amylcinnamoyl)anthranilic acid (3a) had moderate antagonist activities against LTD4-induced smooth muscle contraction on guinea pig ileum and LTC4-induced bronchoconstriction in anesthetized guinea pigs. Modifications were made in the hydrophobic part (cinnamoyl moiety) and the hydrophilic part (anthranilate moiety) of 3a. A series of 8-(benzoylamino)-2-tetrazol-5-yl-1,4-benzodioxans and 8-(ben
Regio- and Stereospecific Formation of Protected Allylic Alcohols via Zirconium-Mediated S<sub>N</sub>2‘ Substitution of Allylic Chlorides
作者:Richard J. Fox、Gojko Lalic、Robert G. Bergman
DOI:10.1021/ja075967i
日期:2007.11.1
regio- and stereospecific SN2‘ substitution reaction between a zirconium oxo complex and allylicchloride has been achieved. The resulting allylic alcohol or TBS-protected allylic ether products were isolated in good to excellent yields with a wide range of E-allylic chlorides. A mechanism for the SN2‘ allylic substitution consistent with kinetic, stereochemical, and secondary isotope effect studies
Enyne cyclization via photoinduced electron transfer (PET) generated electrophilic selenium species: a new carbon–carbon bond formation strategy
作者:Ganesh Pandey、B. B. V. Soma Sekhar
DOI:10.1039/c39930000780
日期:——
An efficient and mild methodology of enyne cyclization using PET-generated diphenyl diselenide radical cation as electrophilic species is reported.
本文报道了一种高效温和的九烃环化方法,该方法使用PET产生的二苯基二硒醚自由基阳离子作为亲电试剂。
Enyne cyclisation by photoinduced electron transfer (PET) promoted in situ generated electrophilic selenium species: A new carbocyclisation strategy
作者:Ganesh Pandey、B.B.V. Soma Sekhar
DOI:10.1016/0040-4020(94)01042-x
日期:1995.1
A new strategy for the carbocyclisation of enynes by PET initiated in situ generated electrophilic selenium species from diphenyldiselenide (PhSeSePh) is reported. The structure of the reactive selenium intermediate is also discussed.
Construction of Enantioenriched Cyclic Compounds by Asymmetric Allylic Alkylation and Ring-Closing Metathesis
作者:Francesca Giacomina、Alexandre Alexakis
DOI:10.1002/ejoc.201300971
日期:2013.10
A new approach to highly enantioenrichedcycliccompounds (up to 98 % ee) has been developed by using ω-ethylenic allylic substrates in a one-pot asymmetricallylicalkylation and ring-closingmetathesis sequence. The starting compounds are synthetic equivalents of cyclicallylic substrates. The method is exemplified with both Cu and Ir catalysts, and chiral phosphoramidite ligands.
通过在一锅不对称烯丙基烷基化和闭环复分解序列中使用 ω-烯属烯丙基底物,开发了一种高度对映体富集的环状化合物(高达 98% ee)的新方法。起始化合物是环状烯丙基底物的合成等价物。该方法以 Cu 和 Ir 催化剂以及手性亚磷酰胺配体为例。