Triple Benzannulation of Naphthalene via a 1,3,6-Naphthotriyne Synthetic Equivalent. Synthesis of Dibenz[<i>a</i>,<i>c</i>]anthracene
作者:Philip Z. Mannes、Evans O. Onyango、Gordon W. Gribble
DOI:10.1021/acs.joc.5b01972
日期:2015.11.6
A new synthesis of dibenzo[a,c]anthracene (4) is described that features the generation, from tetrabromo-bis-triflate 1 and phenyllithium, of a 1,3,6-naphthotriyne (2) synthetic equivalent that is trapped with 3 equiv of furan to form Diels–Alder tris-adduct 3. A subsequent two-step deoxygenation of 3 represents the first synthesis of dibenz[a,c]anthracene (4) that involves a tandem aryne Diels–Alder
描述了一种新的二苯并[ a,c ]蒽(4)合成方法,其特征是由四溴代双三氟甲磺酸酯1和苯基锂生成1,3,6-萘三炔(2)合成等价物,该等价物被3捕获。当量的呋喃形成Diels–Alder tris加合物3。随后的两步式3脱氧代表了苯并[ a,c ]蒽的首次合成(4),涉及串联芳烃Diels-Alder环加成-脱氧策略。