Application of Furan as a Diene: Preparation of Condensed 1,3-Oxazines by Retro-Diels−Alder Reactions
作者:Géza Stájer、Ferenc Miklós、Iván Kanizsai、Ferenc Csende、Reijo Sillanpää、Pál Sohár
DOI:10.1002/ejoc.200400247
日期:2004.9
methanobenzocyclooctenepyrrolo[1,3]oxazine 10, together with the retro-Diels−Alder products pyrrolooxazinone 7, oxazinoisoindolones 8 and 9, and oxazinopyrrolobenzocyclooctene 11. On reflux in chlorobenzene, furan was released from the oxanorbornene heterocycles 5 and 10 to give the retro-Diels−Alder products. The structures of the new compounds were established by NMR spectroscopy and also (for 6 and 9) by single-crystal
(Di-exo-3-amino-7-oxabicyclo[2.2.1]hept-5-en-2-yl)甲醇 (3) 用氧代羧酸 [p-toluoylpropionic acid, cis- or trans-(p -甲苯甲酰基)环己烷羧酸、-苯甲酸或甲苯并环辛烯甲酸]以提供氧代降冰片烯稠合的吡咯并[1,3]恶嗪4、异吲哚并[1,3]恶嗪5和6,以及甲苯并环辛烯吡咯并[1,3]恶嗪10 ,连同逆狄尔斯-阿尔德产物吡咯并恶嗪酮 7、恶嗪基异吲哚酮 8 和 9 以及恶嗪基吡咯并苯并环辛烯 11。在氯苯中回流时,呋喃从氧降冰片烯杂环 5 和 10 中释放出来,得到逆狄尔斯-阿尔德产物。新化合物的结构通过核磁共振光谱确定,也通过单晶 X 射线结构测定(对于 6 和 9)确定。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim,