Assembly of Complex 1,4‐Cycloheptadienes by (4+3) Cycloaddition of Rhodium(II) and Gold(I) Non‐Acceptor Carbenes
作者:Helena Armengol‐Relats、Mauro Mato、Antonio M. Echavarren
DOI:10.1002/anie.202012092
日期:2021.1.25
The formal (4+3) cycloaddition of 1,3‐dienes with Rh(II) and Au(I) non‐acceptor vinyl carbenes, generated from vinylcycloheptatrienes or alkoxyenynes, respectively, leads to 1,4‐cycloheptadienes featuring complex and diverse substitution patterns, including natural dyctiopterene C′ and a hydroxylated derivative of carota‐1,4‐diene. A complete mechanistic picture is presented, in which Au(I) and Rh(II)
1,3-二烯与Rh(II)和Au(I)非受体乙烯基碳烯的正式(4 + 3)环加成反应分别由乙烯基环庚烯或烷氧炔生成,导致1,4-环庚二烯具有复杂而多样的取代作用包括天然dyctiopterene C'和carota-1,4-diene的羟基化衍生物。呈现了完整的机理图,其中显示了Au(I)和Rh(II)非受体乙烯基碳烯经历了乙烯基环丙烷化/ Cope重排或以未经证实的方式发生的直接(4 + 3)环加成反应。