Stereoselective Syntheses of Spirane Bridged Semi-titanocenes
作者:Kjell Undheim、Vidar Bjørnstad
DOI:10.1055/s-2008-1032205
日期:2008.3
complexation to titanium are described. The focus has been on methodology for stereoselective synthesis of ANSA half-sandwich titanocenes with rigid C 2 - and C 3 -bridges which are embedded in a spirane scaffold. Intermediate reactions involve tandem acylation-alkylation in the conversion of a carbonyl carbon into a quaternary carbon and rhodium(I)-effected spiroannulations. Titanocene formation involved
描述了二齿环戊二烯醇盐配体的合成及其与钛的络合。重点一直是立体选择性合成具有嵌入螺旋体支架中的刚性 C 2 - 和 C 3 - 桥的 ANSA 半夹层二茂钛的方法。中间反应涉及将羰基碳转化为季碳和铑 (I) 影响的螺环化过程中的串联酰化-烷基化。茂钛的形成涉及二锂化配体与氯化钛(III)之间的反应,以及随后用氯化铅(II)氧化三价钛,由此形成半茂金属。