SN2′-substitution of secondary alkylcopper reagents with propargylic phosphates enables the preparation of stereodefined alkylallenes. By using enantiomerically enriched alkylcopper reagents and enantioenriched propargylic phosphates as electrophiles anti-SN2′-substitutions were performend leading to α-chiral allenes in good yields with excellent regioselectivity and retention of configuration. DFT-calculations
仲烷基
铜试剂与炔丙基
磷酸酯的非对映选择性S N 2'取代使得能够制备立体确定的烷基亚烷基。通过使用对映体富集的烷基
铜试剂和对映体富集的炔丙基
磷酸酯作为亲电子试剂,抗-S N 2'取代反应以高收率产生α-手性烯丙基,具有出色的区域选择性和构型保留。进行DFT计算以合理化这些烷基
铜试剂在各种溶剂中的结构,强调它们在THF中的构型稳定性。