Aromatic nucleophilic substitution. Part 2. Preparation of novel 3-substituted xanthone and thioxanthone derivatives
作者:Walter Fischer、Vratislav Kvita
DOI:10.1002/hlca.19850680406
日期:1985.6.26
3-nitro-9-oxo-9H-thioxanthene-l-carboxylic acids 2a–d were prepared by intramolecular acylation of 3-aryloxy- and 3-arylthio-5-nitrophthalic anhydrides 1 (Scheme). The 3-nitro group was readily substituted by O- and S-nucleophiles and halide and azide ions to give a range of 3-substituted thioxanthone derivatives 3 with varied λmax.
新颖的3-硝基-9-氧代-9 ħ -xanthene-和3-硝基-9-氧代-9- ħ -thioxanthene -1-羧酸图2a-d是由3-芳氧基和3-芳硫基的分子内酰化反应制备-5-硝基邻苯二甲酸酐1(方案)。3-硝基被容易地通过O-和S-亲核试剂和卤化物和叠氮离子取代以得到范围3-取代噻吨酮衍生物的3具有不同λ最大。