Intramolecular Nozaki–Hiyama–Kishi reactions and Ln(III)-catalyzed allylic rearrangement as the key steps towards 10-membered ring enediynes
摘要:
A general and facile synthesis of the 3-substituted 10-membered ring enediynes 18-22 from the aldehydes 8 and 15 has been established by utilizing the intramolecular Nozaki-Hiyama-Kishi reaction and the lwanthanide(III)-catalyzed rearrangement of allylic alkoxyacetates as the key steps. This work provides ready access to the (E)-3-acyloxy-4-(arylmethylidene)cyclodeca-1,5-diynes, which can be converted into the bioactive enediynes under physiological conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.
使用有效的无过渡金属策略已成功制备了许多2-(杂)芳基取代的噻吩并[3,2- b ]吲哚,涉及费斯曼合成的5-(杂)芳基-3-羟基噻吩甲基2-溴-3-(杂)芳基丙烯酸酯和巯基乙酸甲酯的-2-羧酸酯,并将合成的3-羟基酯转化为相应的噻吩-3(2 H)-one,然后用芳基肼处理直接形成通过菲舍尔(Fischer)树脂化获得目标结构。同时,获得的噻吩并[3,2- b由于多种可用的起始材料,包括2-溴-3-(杂)芳基丙烯酸酯和芳基肼,已经获得了吲哚。另外,两个π-延伸的分子,即1,4-双(4 H-噻吩并[3,2 - b ]吲哚-2-基)苯和2,5-双(4 H-噻吩并[3,2- b ]吲哚-2-基)噻吩已按照目前对2-(杂)芳基噻吩并[3,2- b ]吲哚的方法合成。