Treatment of 1-(3,5-di-tert-butyl-2-hydroxyphenyl)pyridinium halides (1a–1c) with Raney Ni–Al alloy in an alkaline solution afforded the corresponding 2,4-di-tert-butylbenzoxazolo[3,2-a]-5a,6,7,8,9,10-hexahydropyridines (4a–4c). In the case of 1b, 2,4-di-tert-butylbenzoxazolo [3,2-a]-5a,6,7,10-tetrahydro-8-methylpyridine (5) was also obtained as a by-product.
在碱性溶液中用 Raney Ni-Al 合
金处理 1-(3,5-二叔丁基-2-羟基苯基)
吡啶鎓 (1a-1c) 得到相应的 2,4-二叔丁基
苯并恶唑[3] ,2-a]-5a,6,7,8,9,10-六氢
吡啶 (4a–4c)。在1b的情况下,2,4-二叔丁基
苯并恶唑并[3,2-a]-5a,6,7,10-四氢-8-
甲基吡啶(5)也作为副产物得到。