The benzene ring of indolin-2-ones (2-oxindoles) and 3,4-dihydroquinol-2-ones was converted to a saturated cyclohexane ring by hydrogenation in the presence of the rhodium complex Cy(CAAC)Rh(cod)Cl. The stereoselectivity of the process was found to be high with respect to both external substituent R1 within the saturated part of the heterocyclic ring and substituent X on the benzene ring. Twenty-one
在
铑配合物Cy(
CAAC)Rh(cod)Cl的存在下,通过氢化将
吲哚-2-酮(2-氧
吲哚)和3,4-二氢
喹啉-2-酮的苯环转化为饱和的
环己烷环。发现该方法相对于杂环的饱和部分内的外部取代基R 1和苯环上的取代基X均具有较高的立体选择性。21个六氢
吲哚-2(3 H)-一(产率70-99%,dr = 83/17至> 99/1)和十二个八氢-2(1 H)-
喹啉酮(87-96%产率,dr =得到64/36至> 99/1)的主要非对映异构体,其氢原子呈顺式安排。对官能团的高耐受性以及与现有立体异构中心的相容性是此处介绍的氢化方案的关键特征。