作者:Sindhu Kancherla、Kåre B. Jørgensen
DOI:10.1021/acs.joc.0c01097
日期:2020.9.4
Polycyclic aromatic hydrocarbons (PAHs) with six and seven rings were synthesized via directed metalation and cross-coupling of chrysenyl N,N-diethyl carboxamides with o-tolyl and methylnaphthalenyl derivatives. In the presence of competing ortho sites, the site selectivity in iodination of chrysenyl amides by directed ortho metalation (DoM) was influenced by the lithium base. The catalyst ligand bite angle
通过直接金属化和将Chrysenyl N,N-二乙基羧酰胺与邻甲苯基和甲基萘衍生物进行交叉偶联,合成了具有六个和七个环的多环芳烃(PAH)。在存在相互竞争的邻位点的情况下,通过定向邻位金属化(D oM)受锂碱的影响。催化剂配体的咬合角在空间受阻的庞大PAH的交叉偶联中可能很重要。随后在标准条件下和升高的温度下对联芳基进行定向远程金属化处理,得到了各种稠合的六环和七环多环芳烃,它们均具有良好的收率和荧光特性。