作者:Calver A. Main、Shahzad S. Rahman、Richard C. Hartley
DOI:10.1016/j.tetlet.2008.05.094
日期:2008.8
titanium carbenoid reagents (Schrock carbenes) followed by acid-induced cyclisation of the resulting enol ethers constitutes a new method for the preparation of [4.4], [4.5] and [5.5] spiroacetals (1,6-dioxaspiro[4.4]nonanes, 1,6-dioxaspiro[4.5]decanes and 1,7-dioxaspiro[5.5]undecanes, respectively, sometimes termed 5,5-, 5,6- and 6,6-spiroketals). The titanium carbenoids are easily generated from readily
内酯与功能化钛类卡宾试剂(Schrock卡宾)进行烷基化,然后酸诱导的烯醇醚环化,构成了一种新的制备[4.4],[4.5]和[5.5]螺缩醛(1,6-dioxaspiro [ 4.4]壬烷,1,6-二氧杂螺[4.5]癸烷和1,7-二氧杂螺[5.5]十一烷,有时被称为5,5-,5,6-和6,6-螺酮。易于从容易获得的硫缩醛中生成钛类化合物。