Serendipitous Rediscovery of the Facile Cyclization of
<i>Z</i>
,
<i>Z</i>
‐3,5‐Octadiene‐1,7‐diyne Derivatives to Afford Stable, Substituted Naphthocyclobutadienes
作者:Joshua E. Barker、Takuya Kodama、Min K. Song、Conerd K. Frederickson、Tanguy Jousselin‐Oba、Lev N. Zakharov、Jérôme Marrot、Michel Frigoli、Richard P. Johnson、Michael M. Haley
DOI:10.1002/cplu.201800605
日期:2019.6
The serendipitous isolation of very small amounts of two naphthocyclobutadiene (NCB) derivatives has led to the computational re-examination of the electrocyclization of Z,Z-3,5-octadiene-1,7-diyne as well as the experimental and computational study of diethynylindeno[2,1-a]fluorene derivatives that contain the 3,5-octadiene-1,7-diyne motif as part of a larger π-framework. In both cases the calculated
偶然分离非常少量的两种萘环丁二烯(NCB)衍生物导致对Z,Z-3,5-辛二烯-1,7-二炔的电环化进行了计算重新检验,以及对Z,Z-3,5-辛二烯-1,7-二炔的电化进行了计算Diethynylindeno [2,1-a]芴衍生物,其包含3,5-辛二烯-1,7-二炔基序作为较大π-框架的一部分。在这两种情况下,计算出的势能表面都强烈暗示了两个连续的电环反应以提供抗芳香族产物。将八二烯二炔片段锁定在反应构象中,假定的二乙炔基[2,1-a]芴中间体可提供适度到良好收率的NCB。