2-氨基-4,5-二氢-3-呋喃甲酰胺在乙酸存在下于吡啶中或在乙酸铵的影响下与吗啉反应生成相应的3-二氨基亚甲基-4,5-二氢-2(3 H )-呋喃酮; 没有分离出4,5-二氢-2-吗啉代-3-呋喃甲酰胺。前者之一与苄基胺反应生成( E )-和( Z )-3-(氨基-(苄基氨基)-亚甲基)-4,5-二氢-4-苯基-2(3 H )-呋喃酮和2-苄氨基-4,5-二氢-4-苯基-3-呋喃甲酰胺。
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。
Testa, Maria G.; Perrini, Giancarlo; Chiacchio, Ugo, Journal of Chemical Research, Miniprint, 1993, # 8, p. 1921 - 1936
作者:Testa, Maria G.、Perrini, Giancarlo、Chiacchio, Ugo、Corsaro, Antonio
DOI:——
日期:——
Synthesis of 1,3-Oxazines and Furo[2,3-b]pyrans by reaction of 2-amino-4,5-dihydro-3-furancarbonitriles with dibenzoyldiazomethanes
2-Amino-4,5-dihydro-3-furancarbonitriles (1) react with a slight excess of dibenzoyldiazomethane in the presence of rhodium(II) acetate to give 1,3-oxazin-4-ones (2). With three equivalents of dibenzoyldiazomethane compounds 1 react to afford furo[2,3-b]pyran-3a-carbonitriles (3). Compound 3a was also obtained by treatment of 2a with two equivalents of dibenzoyldiazomethane.
Simple Efficient Routes for the Preparation of Pyrazoleamines and Pyrazolopyrimidines: Regioselectivity of Pyrazoleamines Reactions with Bidentate Reagents
作者:Moustafa Sherief Moustafa、Saleh Mohammed Al-Mousawi、Mohamed Hilmy Elnagdi
DOI:10.5562/cca2738
日期:——
Simple and efficient routes for the preparation of 2-amino-5-phenyl-4,5-dihydrofuran-3-carbonitrile (12), 2-oxo-5-phenyl-tetrahydrofuran-3-carbonitrile (13) and the 3,5-diaminopyrazole derivative 2h were developed. The results of the reactivity profiles of 12 and 2h are reported and the previously investigated reaction of pyrazole-3,5-diamine (2b) with acrylonitrile to yield compound (31), a N-1 acylation product, is currently justified by using X-ray crystallographic analysis. Taken together, the observation of alkenes and alkynes substitution when reacting with 3,5-diaminopyrazole derivative 2h is explained by the terminal electron withdrawing group. This pattern of substitution is attributed to involvement of sterically unhindered electrophiles primarily at the N-1 position.
Synthesis of 2-amino-3-cyano-4,5-dihydrofurans from ?,?-dicyanoketones
作者:I. V. Moiseeva、P. M. Lukin、O. E. Nasakin、V. N. Romanov、V. A. Tafeenko、A. Kh. Bulai、P. A. Sharbatyan