Reactivity of isocoumarins. V. Reaction of 1-ethoxyisochroman with active methylene compounds.
作者:TADATAKA ISHIKAWA、MASATOSHI YAMATO
DOI:10.1248/cpb.30.1594
日期:——
Active methylene compounds, diethyl malonate, α-tetralone, dimedone, acetyl-acetone, malononitrile, and diketene, were reacted with 1-ethoxyisochroman (1) to give the corresponding 1-substituted isochroman derivatives, 4, 5, 6, 7, 8, 9, 10, and 11, respectively. When 4 was treated with sodium ethoxide or potassium tert-butoxide, ethyl 1, 4-dihydro-2-naphthoate (14a), ethyl 1, 2-dihydro-2-naphthoate (14b), and ethyl 2-naphthoate (13) were obtained. On the other hand, the reaction of 2-(1-isochromanyl) cyclohexanone (3) with potassium tert-butoxide afforded 9-formyl-1, 2, 3, 4-tetrahydroanthracene (20) and 1, 2, 3, 4, 9, 10-hexahydroanthracene (21). The conversion mechanisms of 1-substituted isochromans (2, 3, 4, and 7) into naphthalenes (13, 14a, b, and 18) and 1, 2, 3, 4-tetrahydroanthracenes (20 and 21) are proposed.
活性亚甲基化合物、丙二酸二乙酯、α-四氢萘酮、二美酮、乙酰丙酮、丙二腈和二甲苯与 1-乙氧基异苯并吡喃(1)反应,分别得到相应的 1-取代异苯并吡喃衍生物 4、5、6、7、8、9、10 和 11。将 4 用乙醇钠或叔丁醇钾处理,可得到 1,4-二氢-2-萘甲酸乙酯(14a)、1,2-二氢-2-萘甲酸乙酯(14b)和 2-萘甲酸乙酯(13)。另一方面,2-(1-异氰基)环己酮(3)与叔丁醇钾反应可得到 9-甲酰基-1,2,3,4-四氢蒽(20)和 1,2,3,4,9,10-六氢蒽(21)。提出了 1-取代异色蒽 (2、3、4 和 7) 转化为萘 (13、14a、b 和 18) 和 1、2、3、4-四氢蒽 (20 和 21) 的机制。