Directed <i>ortho</i>-Metalation and Anionic <i>ortho</i>-Fries Rearrangement of Polycyclic Aromatic <i>O</i>-Carbamates: Regioselective Synthesis of Substituted Chrysenes
作者:Sindhu Kancherla、Marianne Lorentzen、Victor Snieckus、Kåre B. Jørgensen
DOI:10.1021/acs.joc.7b03210
日期:2018.4.6
A general method for the regioselective synthesis of a series of ortho-substituted chrysenyl N,N-diethyl-O-carbamates by the directed ortho-metalation (DoM) strategy is reported. The starting O-carbamates were prepared from the corresponding chrysenols, available by oxidative photochemical cyclization or directed remote metalation tactics. Chrysen-1-yl and chrysene-3-yl ring site selectivity of directed
报道了通过定向邻位金属化(D o M)策略区域选择性合成一系列邻位取代的N,N-二乙基-O-氨基甲酸酯的一般方法。起始的O-氨基甲酸酯是由相应的酚类化合物制备的,可以通过氧化光化学环化或直接的远程金属化策略获得。屈(chrysene)哌啶-1-基和苯并菲-3-基环部位选择性定向邻-metalation(d Ò M)和阴离子邻-Fries重排(A ö F)协议,与小号观察到-BuLi / TMEDA,随后使用选择的亲电试剂进行亲电淬灭,产生了新的Chrysenyl衍生物。5屈基N,N-二乙基ø -氨基甲酸酯后行瞬间甲ö ˚F即使在-100℃至配料屈重排Ò羟基甲酰胺。进行了反复的D o M反应,以了解区域选择性因素。