The Diastereoselective Syntheses of Enantiopure Benzo- and Naphtho-pyrans Related to the Aphid Insect Pigments
作者:Robin G. F. Giles
DOI:10.1071/ch03286
日期:——
quinone A′, natural derivatives of the aphid insect pigments protoaphin-fb and protoaphin-sl. These are achieved through intramolecular diastereoselective cyclization of tethered phenolic lactaldehydes. The conformational implications of the cyclization process are discussed. Model reactions allow the formulation of a more concise, convergent route to these natural derivatives through the corresponding
概述了针对对映体纯醌 A 和醌 A'(蚜虫色素 protoaphin-fb 和 protoaphin-sl 的天然衍生物)组装的合成努力。这些是通过束缚酚醛乳醛的分子内非对映选择性环化来实现的。讨论了环化过程的构象含义。模型反应允许通过相应的分子间反应为这些天然衍生物制定更简洁、收敛的路线,其中所需的互补非对映选择性是通过选择苯酚钛或镁与乙氧基乙基保护的不对称乳醛反应来提供的。