Intramolecular Reactions. II. The Mechanism of the Cyclization of Diazotized 2-Aminobenzophenones<sup>1,2</sup>
作者:DeLos F. DeTar、Douglas I. Relyea
DOI:10.1021/ja01635a066
日期:1954.3
A Rapid and Efficient Access to Diaryldibenzo[<i>b</i>,<i>f</i>][1,5]diazocines
作者:Xiao Wang、Jianzhong Li、Na Zhao、Xiaobo Wan
DOI:10.1021/ol102957c
日期:2011.2.18
2-Benzoylbenzoyl azides undergo facile cyclization under acidic conditions to give substituted dibenzo[b,f][1,5]-diazocines in good yields. This approach shortens the synthetic steps toward these compounds as compared with conventional methods. The mechanism of the diazocine synthesis is assumed to proceed by an unprecedented intermolecular [2 + 2] cyclization.