Synthesis of cationic dibenzosemibullvalene-based phase-transfer catalysts by di-π-methane rearrangements of pyrrolinium-annelated dibenzobarrelene derivatives
作者:Heiko Ihmels、Jia Luo
DOI:10.3762/bjoc.7.17
日期:——
Dibenzobarrelene derivatives, that are annelated with a pyrrolinium unit [N,N-dialkyl-3,4-(9',10'-dihydro-9',10'-anthraceno-3-pyrrolinium) derivatives], undergo a photo-induced di-pi-methane rearrangement upon triplet sensitization to give the corresponding cationic dibenzosemibullvalene derivatives [N,N-dialkyl-3,4-8c,8e-(4b,8b-dihydrodibenzo[a,f]cyclopropa[cd]pentaleno)}pyrrol idinium derivatives]. Whereas
与吡咯啉单元 [N,N-二烷基-3,4-(9',10'-dihydro-9',10'-anthraceno-3-pyrrolinium) 衍生物] 退火的二苯并二甲苯衍生物经历光诱导三重敏化后的二-π-甲烷重排得到相应的阳离子二苯并半戊烯衍生物 [N,N-dialkyl-3,4-8c,8e-(4b,8b-dihydrodibenzo[a,f]cyclopropa[cd]pentaleno)}吡咯鎓衍生物]。虽然二苯甲酮官能团与吡咯啉氮原子的共价连接不会导致内部三线态敏化,但引入二苯甲酮单元作为抗衡离子的一部分能够使固体中二苯甲芘衍生物的二-π-甲烷重排 -状态。