Gold(I)‐Catalyzed [8+2]‐Cycloaddition of 8‐Aryl‐8‐azaheptafulvenes with Allenamides and Ynamides: Regioselective Synthesis of Dihydrocycloheptapyrrole Derivatives
作者:Tatiana Suárez‐Rodríguez、Ángel L. Suárez‐Sobrino、Alfredo Ballesteros
DOI:10.1002/chem.202005348
日期:2021.4.26
higher‐order [8+2] cycloadditions of 8‐aryl‐8‐azaheptafulvenes 1 with allenamides 2 and ynamides 3 were studied. 1,8‐Dihydrocycloheptapyrroles 4 were achieved by a regioselective [8+2] cycloaddition of azaheptafulvenes 1 and allenamides 2 in the presence of (2,4‐ditBuC6H3O)3PAuNTf2 as catalyst. Besides, ynamides 3 and 8‐aryl‐8‐azaheptafulvenes 1, undergo a regioselective [8+2] cycloaddition, to give 2‐amido‐1
研究了金(I)催化的8-芳基-8-氮杂庚烯富烯1与烯丙酰胺2和炔酰胺3的高阶[8 + 2]环加成反应。1,8- Dihydrocycloheptapyrroles 4是由一个区域选择性实现[8 + 2] azaheptafulvenes的环加成1和allenamides 2中的(2,4-二叔存在吨BUC 6 ħ 3 O)3 PAuNTf 2作为催化剂。此外,酰胺3和8-芳基-8-azaheptafulvenes 1进行区域选择性[8 + 2]环加成反应,得到2-氨基-1,4-二氢环庚基吡咯7在JohnPhosAuNTf 2作为催化剂的情况下。两种反应均以高收率和各种取代基进行。一个合理的机制假说表明8-氮杂庚烯对烯丙酰胺和乙酰胺的金激活电子富集的丙二烯或炔烃部分有亲核攻击。