Studies on prostaglandins. II. Synthesis of 4-alkoxymethyl-2-norbornen-5-one and its oxidation reaction with m-chloroperbenzoic acid.
作者:NORIYOSHI INUKAI、HIDENORI IWAMOTO、NORIAKI NAGANO、ISAO YANAGISAWA、TOSHINARI TAMURA、YOSHIO ISHII、MASUO MURAKAMI
DOI:10.1248/cpb.24.2517
日期:——
4-Alkoxymethyl-5-chloro-5-cyano-2-norbornene (III) was produced by the Diels-Alder reaction using 5-alkoxymethyl-cyclopentadiene and α-chloroacrylonitrile in the presence of aqueous cupric boronfluoride. III was hydrolyzed to 4-alkoxymethyl-2-norbornen-5-one (V). When V was oxidized with m-chloroperbenzoic acid, the products were varied by differences of the reaction conditions. (3β-Methoxymethyl-3α-hydroxy-4-cyclopenten-1α-yl)-acetic acid lactone (IXa) was produced by the oxidation of 4-meth-oxymethyl-2-norbornen-5-one (Va) with m-chloroperbenzoic acid in the presence of aqueous sodium bicarbonate. IXa which was very unstable was easily rearranged to 5-meth-oxymethyl-3, 3aβ, 4, 6aβ-tetrahydro-2H-cyclopenta [b] furan-2-one (Xa).
4- 烷氧基甲基-5-氯-5-氰基-2-降冰片烯(III)是由 5-烷氧基甲基环戊二烯和 α-氯丙烯腈在氟化铜硼水溶液存在下通过 Diels-Alder 反应生成的。III 被水解为 4-烷氧基甲基-2-降冰片烯-5-酮(V)。当 V 被间氯过苯甲酸氧化时,反应条件不同,产物也不同。(在碳酸氢钠水溶液中,4-甲氧基甲基-2-降冰片烯-5-酮(Va)与间氯过苯甲酸氧化生成了(3β-甲氧基甲基-3α-羟基-4-环戊烯-1α-基)乙酸内酯(IXa)。非常不稳定的 IXa 很容易重新排列为 5-甲基氧甲基-3,3aβ,4,6aβ-四氢-2H-环戊并[b]呋喃-2-酮(Xa)。