A New Access to Enantiopuresyn- andanti-2-Methyl-1,3-diol Moieties from Chiral Nonracemic α-Bromo α′-Sulfinyl Ketones Promoted by Samarium Diiodide
作者:Françoise Colobert、Michel Obringer、Guy Solladié
DOI:10.1002/ejoc.200500782
日期:2006.3
sequence that involves a SmI2-promoted stereoselective Reformatsky addition of chiral nonracemic α-bromo α′-sulfinyl ketones to various aldehydes followed by stereoselective reduction of the Reformatsky adduct. The absolute configuration of the products was determined by comparison with literature data and by 1H NMR NOESY experiments. The observed stereoselectivities can be explained in terms of a boat
合成和反 2-甲基-1,3-二醇已通过两步序列制备,该序列涉及 SmI2 促进的立体选择性重组,将手性非外消旋 α-溴 α'-亚磺酰基酮与各种醛加成,然后立体选择性还原Reformatsky 加合物。通过与文献数据和 1 H NMR NOESY 实验比较确定产物的绝对构型。观察到的立体选择性可以用船过渡态来解释。醛的功能化和手性亚砜的去除或转化将使这种方法能够应用于生物活性分子的全合成。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)