Investigations Concerning an Unexpected Reaction between the Dimsyl Anion ( = (Methylsulfinyl)methanide) and a ?,?-Epoxy-ketone
作者:Ren� Beerli、Hans-J�rg Borschberg
DOI:10.1002/hlca.19920750117
日期:1992.2.5
1RS, 2RS,1′SR via NOE measurements performed on a derivative thereof. A crossover experiment in DMSO/[13C2]DMSO 1:1 as solvent showed that the two additional C-atoms of this product originate from a single molecule of DMSO (Scheme 5). A tentative mechanistic scheme, consistent with all experimental observations, is proposed which involves a [2,3]-sigmatropic rearrangement of an (allylsulfinyl)methanide
2,2-二甲基-5-(1,2-环氧丙基)环己酮(7)与t- BuOK在DMSO中的反应提供了少量的5-(1-羟基丙-2-烯基)-2,2-二甲基环己酮(12)和4个意外的产物13–16,它们包含1-3个额外的C原子(方案2)。主要产物1-(4',4'-二甲基-2',3'-二甲叉基亚环己基)丙烷-1,2-二醇(15)的相对构型显示为1 RS,2 RS,1'SR在其导数上执行NOE测量。DMSO / [ 13 C 2中的交叉实验DMSO 1:1作为溶剂表明,该产品的另外两个C原子源自DMSO的单个分子(方案5)。提出了一个与所有实验观察结果一致的试验性机理方案,该方案涉及将(烯丙基亚磺酰基)甲烷的[2,3]-σ重排为亚硫酸,这是关键步骤之一(V 24,方案8)。通过求助于模型化合物(7-(甲基亚磺酰基)-p-薄荷脑-1,8-二烯(32/33),可以很容易地从紫苏醇(30)分两步制备的方法中,我们