化学
对映选择合成
艾伦
区域选择性
立体化学
羧化
催化作用
马尔科夫尼科夫法则
药物化学
有机化学
作者
Yu‐Ru Ou,Ye Qi,Wei Deng,Zheng‐Yang Xu
标识
DOI:10.1002/ejoc.202201422
摘要
Abstract The CuH‐catalyzed hydrocarboxylation of allenes is an enantio‐ and regioselective approach for the synthesis of (S)‐carboxyl‐containing compounds. With density functional theory (DFT) calculations, we elucidate the reaction mechanism and the origins of the enantioselectivity and regioselectivity. The hydrocarboxylation proceeds through the migratory insertion of allenes on CuH complex, the enantioselective addition of fluoroformate, and the β‐fluoride elimination gives the branched carboxylation products. The electron‐donating alkyl and phenyl groups in the allene polarize the C=C bond and thus lead to the anti‐Markovnikov‐selective migratory insertion. In addition, the enantioselective addition of fluoroformate by either (R)‐ or (S)‐addition determines the enantioselectivity. The (S)‐addition is more favorable due to the bulky −tBu group of (R)‐DTBM‐SEGPHOS ligand, which prefers keeping the C=C bond of allene away from the reaction center in six‐membered transition state and thus results in (S)‐carboxyl‐containing products.
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