Michael addition of (1H)pyrrole.
作者:KATSUHIDE MATOBA、TAKAO YAMAZAKI
DOI:10.1248/cpb.30.2586
日期:——
[1H] Pyrrole (IIa) was reacted with 2-chloroethyl tosylate (III) in acetone in the presence of potassium hydroxide (condition A) to give 1-(4-oxo-2-methyl-2-pentyl) [1H]-pyrrole (IV) instead of 1-(2-tosyloxyethyl) [1H] pyrrole (IIb). IV was obtained from the reaction of IIa and mesityl oxide (V) in acetonitrile in the presence of potassium hydroxide (condition B). With IIa under condition B, crotononitrile, ethyl crotonate, and 4, 4-dimethyl-2-cyclohexenone (IX) gave 3-(1-[1H] pyrrolyl) butyronitrile (VIIa), 3-(1-[1H] pyrrolyl) butyric acid (VIIIa), and a mixture of 4, 4-dimethyl-3-(1-[1H] pyrrolyl) cyclohexanone (X) and 1-cyanomethyl-4, 4-dimethyl-3-(1-[1H] pyrrolyl) cyclohexanol (XI), respectively.
[1H]吡咯(IIa)与2-氯乙基对甲苯磺酸酯(III)在丙酮中,以氢氧化钾(条件A)反应,结果得到1-(4-氧代-2-甲基-2-戊基)[1H]吡咯(IV),而非1-(2-对甲苯磺酰氧基乙基)[1H]吡咯(IIb)。IV是通过IIa与苯并环戊二烯酮(V)在乙腈中,以氢氧化钾(条件B)反应得到的。在条件B下,IIa与巴豆腈、巴豆酸乙酯和4,4-二甲基-2-环己烯酮(IX)反应,分别得到3-(1-[1H]吡咯基)丁腈(VIIa)、3-(1-[1H]吡咯基)丁酸(VIIIa),以及4,4-二甲基-3-(1-[1H]吡咯基)环己酮(X)和1-氰甲基-4,4-二甲基-3-(1-[1H]吡咯基)环己醇(XI)的混合物。