Treatment of N-substituted 2-(methylamino)naphthoquinones 3 and -anthracene-1,4-diones 4 with S2Cl2 and DABCO in chlorobenzene gave the corresponding 2,3-dihydronaphtho[2,3-d][1,3]thiazole-4,9-diones 1 and 2,3-dihydroanthra[2,3-d][1,3]thiazole-4,11-diones 2 by triethylamine addition, in high to moderate yields. The DABCO replacement for N-ethyldiisopropylamine in the reaction of anthracene-1,4-diones 4 led unexpectedly to the corresponding 2-thioxo-2,3-dihydroanthra[2,3-d][1,3]thiazole-4,11-diones 10. The reaction of 3H-spiro[1,3-thiazole-2,1'-cyclohexanes] 1d, 2d with Et3N in chlorobenzene under reflux yielded 2,3,4,5-tetrahydro-1H-carbazole-6,11-diones 15, 16, i.e., ring contraction and fusion products. A plausible mechanism was proposed for the formation of the products.
在氯苯中使用S2Cl2和DABCO处理N-取代的2-(甲氨基)萘醌3和蒽-1,4-二酮4,通过三乙胺加成反应,高到中等收率得到相应的2,3-二氢萘[2,3-d][1,3]噻唑-4,9-二酮1和2,3-二氢蒽[2,3-d][1,3]噻唑-4,11-二酮2。DABCO替代N-乙基二异丙胺在蒽-1,4-二酮4的反应中意外地导致相应的2-硫代-2,3-二氢蒽[2,3-d][1,3]噻唑-4,11-二酮10。3H-螺[1,3-噻唑-2,1'-环己烷]1d,2d在氯苯中回流与Et3N反应,收率为中等到高,得到2,3,4,5-四氢-1H-咔唑-6,11-二酮15,16,即环收缩和融合产物。提出了产物形成的一种合理机理。