Described herein is the development of an arenophile-mediated, nickel-catalyzed dearomative trans-1,2-carboamination protocol. A range of readily available aromatic compounds was converted to the corresponding dienes using Grignard reagents as nucleophiles. This strategy provided products with exclusive trans-selectivity and high enantioselectivity was observed in case of benzene and naphthalene. The utility of this methodology was showcased by controlled and stereoselective preparation of small, functionalized molecules.
A concise synthesis of (+)-pancratistatin and (+)-7-deoxypancratistatin from benzene using an enantioselective, dearomative carboamination strategy has been achieved. This approach, in combination with the judicious choice of subsequent olefin-type difunctionalization reactions, permits rapid and controlled access to a hexasubstituted core. Finally, minimal use of intermediary steps as well as direct, late stage C-7 hydroxylation provides both natural products in six and seven operations.
本文描述了一个以砂土为介质、
镍催化的亲芳香性转位1,2-
碳胺化协议的开发。利用
格氏试剂作为亲核试剂,将一系列易得的芳香化合物转化为相应的二
烯烃。该策略提供了具有独特的反式选择性的产物,并观察到
苯和
萘的高对映选择性。这种方法的实用性通过对小型、官能化分子的控制和立体选择性制备得到展示。
利用一个具有对映选择性的、亲芳香性
碳胺化策略,从
苯中简洁合成了(+)-pancratistatin和(+)-7-deoxypancratistatin。这种方法与后续
烯烃型双官能化反应的谨慎选择相结合,可以快速、有控制地获得一个六取代核心。最后,最小化中间步骤的使用以及直接的、后期的C-7羟基化反应,使得这两种
天然产物可以在六到七个步骤内合成。