作者:Delphine Brugier、Francis Outurquin、Claude Paulmier
DOI:10.1039/b003580g
日期:——
tert-Butyl 2-allyl- and N-allyl-3-thienylcarbamates were used as substrates for the preparation of thieno[3,2-b]pyrroles 9 and 5,6-dihydrothieno[3,2-b]pyrroles 10. Pd-catalyzed cyclization of N-allyl-(2-bromo-3-thienyl)carbamates 12 has allowed access to thienopyrroles 9. The radical route has led to the formation of a dihydrothienopyrrole 10 or a tetrahydrothienopyridine 19 according to the β-substitution of the allyl substituent. The nucleophilic participation of the tert-butoxycarbonyl group occurred during the selenium or iodine-induced cyclization of tert-butyl 2-allyl- or N-allyl-3-thienylcarbamates. The formation of the thienooxazepinone 25 and N-(3-thienyl)oxazolidinones 28 and 29 was observed.
叔丁基2-烯丙基和N-烯丙基-3-噻吩基氨基甲酸酯被用作底物,以制备噻吩[3,2-b]吡咯9和5,6-二氢噻吩[3,2-b]吡咯10。钯催化的环化反应中,N-烯丙基-(2-溴-3-噻吩基)氨基甲酸酯12使得噻吩吡咯9的合成成为可能。自由基途径则根据烯丙基取代基的β-取代,引导形成二氢噻吩吡咯10或四氢噻吩吡啶19。叔丁氧羰基基团在硒或碘诱导的叔丁基2-烯丙基或N-烯丙基-3-噻吩基氨基甲酸酯的环化过程中发生了亲核参与。观察到了噻吩并噁唑啉酮25和N-(3-噻吩基)噁唑烷酮28和29的形成。