allows achieving superior degrees of regioselectivity and yields in the desaturation of alcohols compared to those obtained by the state-of-the-art desaturation methods. The HAT at unactivated C(sp3)-H sites is enabled by the easily installable/removable Si-auxiliaries. Formation of the key hybrid alkyl Pd-radical intermediates is efficiently induced by visible light from alkyl iodides and Pd(0) complexes
已经开发了一种通用的、有效的和位点选择性的可见光诱导的 Pd 催化的脂肪醇远程去饱和成有价值的烯丙基、高烯丙基和双高烯丙基醇。这种转变通过混合 Pd 自由基机制进行,该机制协同结合了自由基方法的有利特征,例如简便的远程 CH HAT 步骤,与过渡金属催化化学(选择性β-氢消除步骤)的特征。与通过最先进的去饱和方法获得的那些相比,这允许在醇的去饱和中实现更高程度的区域选择性和收率。未激活的 C(sp3)-H 站点的 HAT 由易于安装/可拆卸的 Si 助剂启用。烷基碘化物和 Pd(0) 配合物的可见光可有效诱导关键杂化烷基 Pd-自由基中间体的形成。值得注意的是,该方法不需要外源性光敏剂或外部氧化剂。
Sarytschewa et al., Zhurnal Obshchei Khimii, 1957, vol. 27, p. 2994,2996;engl.Ausg.S.3023,3025
作者:Sarytschewa et al.
DOI:——
日期:——
[EN] PROCESS FOR THE PREPARATION OF R-(-)-3- (CARBAMOYLMETHYL)-5-METHYLHEXANOIC ACID AND THE INTERMEDIATES<br/>[FR] MÉTHODE DE PRÉPARATION D'ACIDE R-(-)-3-(CARBAMOYLMÉTHYL)-5-MÉTHYLHEXANOÏQUE ET DE SES INTERMÉDIAIRES
申请人:DR BRAJA SUNDAR PRADHAN
公开号:WO2012093411A2
公开(公告)日:2012-07-12
The invention provides a process for resolution of R (±) - 3- (carbamoylmethyl)-5-methylhexanoic acid I to form enantiomerically pure form of compound of formula (I), the said process comprises resolution of racemic mixture of compound of formula (II) with cinchona class of alkaloids or amines. The invention also provides for a process for preparing (S)-3-(aminomethyl)-5- methylhexanoic acid from R (-)-3-(carbamoylmethyl)-5-methylhexanoic acid I.
Expeditious Synthesis of Hippuristanol and Congeners with Potent Antiproliferative Activities
作者:Wei Li、Yongjun Dang、Jun O. Liu、Biao Yu
DOI:10.1002/chem.200901732
日期:2009.10.12
Rapid access: An expeditioussynthesis of hippuristanol was developed that allowed rapid access to a number of analogues with structural alteration at its E and F rings (see scheme), facilitating the structure–activity relationship studies of the novel inhibitor of eukaryotic translation initiation.