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。