A Brønsted acid-promoted cyclodimerization of C(3)-, C(2)-, or N(1)-substituted indole ketone derivatives is described. A wide range of structurally diverse bisindole fused-9-oxabicyclo[3.3.1]nonane and bisindole fused-cyclooctatetraene (COT) derivatives can be prepared in good to high yields with high efficiency.
Substituted phenyl, naphthyl, and thienyl N-hydroxy urea compounds form a class of potent inhibitors of 5- and 12-lipoxygenase and are thus useful compounds in the treatment of inflammatory disease states where leukotrienes and other products of lipoxygenase enzyme activity are implicated.
Convenient synthesis of 2,5-disubstituted thiophene from 1,6-dioxo-2,4-diene
作者:Chi Wi Ong、Chong Ming Chen、Long Fu Wang、Po Chuen Shieh
DOI:10.1016/s0040-4039(98)02094-2
日期:1998.12
Reaction of 1,6-dioxo-2,4-diene with P2S5 and Lawesson'sreagent affords the 2,5-disubstituted thiophene. This reaction can take place regioselectively in the presence of BF3-etherate catalysis, useful for the synthesis of arylthiophene.
1,6-二氧代-2,4-二烯与P 2 S 5和Lawesson试剂反应,得到2,5-二取代的噻吩。该反应可以在BF 3-醚酸酯催化的存在下区域选择性地发生,这对于芳基噻吩的合成是有用的。