Efficient Synthesis of the Azabicyclo[3.3.1]nonane Ring System in the Alkaloid Methyllycaconitine Using Bis(alkoxymethyl)alkylamines as Aminoalkylating Agents in a Double Mannich Reaction
作者:Margaret A. Brimble、Constanze Brocke
DOI:10.1002/ejoc.200500003
日期:2005.6
The double Mannich reaction of cyclic β-keto esters with bis(alkoxymethyl)alkylamines provides an efficient and versatile method for the construction of azabicyclo[3.3.1]nonanes and azabicyclo[3.2.1]octanes. The optimum conditions for efficient reaction involve use of the activator trichloromethylsilane in acetonitrile as solvent at ambient temperature. The utility of this synthetic method is further
环状β-酮酯与双(烷氧基甲基)烷基胺的双曼尼希反应为构建氮杂双环[3.3.1]壬烷和氮杂双环[3.2.1]辛烷提供了一种有效且通用的方法。有效反应的最佳条件包括在环境温度下在乙腈中使用活化剂三氯甲基硅烷作为溶剂。通过将关键的 N-(甲基琥珀酰亚胺)邻氨基苯甲酸药效团附加到 N-(3-苯丙基)-取代的双曼尼希生物碱的几个 AE 环类似物 39、42,该合成方法的实用性得到进一步证明。加合物 18, 27。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)