Synthesis of dihydrofuro[2,3-<i>b</i>]pyridines by the reaction of 2-amino-4,5-dihydro-3-furancarbonitriles with α,β-unsaturated carbonyl compounds
作者:Hiroshi Maruoka、Motoyoshi Yamazaki、Yukihiko Tomioka
DOI:10.1002/jhet.5570390420
日期:2002.7
The reactions of 2-amino-4,5-dihydro-3-furancarbonitriles 1a-d with α,β-unsaturated carbonyl compounds in the presence of sodium ethoxide (0.1 equivalent) gave the corresponding Michael adducts 2a-d, 3a-d and 4a-d. Compounds 2a-d and 3a-c reacted with sodium alkoxide (1 equivalent) to yield the corresponding 7a-alkoxyhexahydrofuro[2,3-b]pyridines 5a-d, 6a-d, 7a-c and 8a-c. Treatment of 5a-d, 6a-d,
2-氨基-4,5-二氢-3-呋喃腈1a-d与α,β-不饱和羰基化合物在乙醇钠(0.1当量)存在下的反应得到相应的迈克尔加合物2a-d,3a-d和4a-d。化合物2a-d和3a-c与醇钠(1当量)反应,得到相应的7a-烷氧基六氢呋喃[2,3- b ]吡啶5a-d,6a-d,7a-c和8a-c。用叔丁醇钾处理5a-d,6a-d,7a-c和8a-c产生相应的二氢呋喃并[2,3- b ]吡啶图9a-d和10a-c。4a-c与乙醇钠(1当量)反应,得到相应的二氢呋喃[2,3- b ]吡啶11a-c。