Face Selectivity in theDiels-Alder Additions and Chelotropic Addition of Sulfur Dioxide to 2-(D)Methylidene-3-methylidenebicyclo[2.2.1]heptane
作者:Pierre-Alain Carrupt、Fabienne Berchier、Pierre Vogel
DOI:10.1002/hlca.19850680628
日期:1985.9.25
The stereoselectivity of the cycloadditions of 2-(D)methylidene-3-methylidenebicyclo[2.2.1]heptane (4) to various dienophiles has been determined. The exo- vs.endo-face selectivity depends on the type of dienophiles, and for olefinic ones, on the mode of attack (Alder- vs.anti-Alder endo rule). It is > 9:1 with N-phenyltriazolinedione (NPTAD) and ethylenetetracarbonitrile (TCNE), < 1:9 with dimethyl
已经确定了2-(D)亚甲基-3-亚甲基双环[2.2.1]庚烷(4)对各种亲二烯体的环加成的立体选择性。该外-与内面取向选择性取决于亲双烯的类型和烯烃的,攻击的模式(阿尔德-与反-阿尔德内规则)。它是> 9:1与Ñ -phenyltriazolinedione(NPTAD)和ethylenetetracarbonitrile(TCNE),<1:9与乙炔二(DMAD),30±5:70±5与DMAD中的AlCl存在3,15±5: 85±5与dehydrobenzene和40±5:60±5与1 ö 2光化学产生的(表1)。与对苯醌和马来酸酐中,外切-与内切-面选择性是<1:9和20±5:80±5,分别用于其抗-阿尔德攻击模式; Alder反应模式分别为50±5:50±5和55±5:45±5 。下动力学控制的条件下,加成chelotropic SO的2至4是内切-面选择性。