Intermolecular carbenoid insertions: Reactions of 2-substituted thiophenes with ethyl diazoacetate in the presence of rhodium (II) acetate
作者:Geoffrey K. Tranmer、Alfredo Capretta
DOI:10.1016/s0040-4020(98)01018-7
日期:1998.12
The reactions of ethyldiazoacetate with a series of 2-substituted thiophenes in the presence of catalytic rhodium (II) acetate were examined. In the cases of 2-methylthiophene and 2-(trimethylsilyl)thiophene, cyclopropane and thiopyran products predominated while thiophene-2-thiol and 2-(methylthio)thiophene gave rise to thiopyrans and ethyl 2-(2-thienylsulfanyl)acetate. No reaction was apparent when
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。
A Facile Synthesis of 5-Substituted 2-Furyl-, 2-Thienyl- and 2-Pyrrolylacetates by Cyclodehydration of g-Functionalized a,b-Unsaturated Ketones
作者:Ikuo Ueda、Tomikazu Kawano、Toru Ogawa、Saiful Md. Islam