Preparation of (all-E)- and (11Z)-12-Haloretinals and (11Z,13Z)- and (13Z)-14-Haloretinals by the C15 + C5 Route ? Exploring the Possibility of Preparing any Retinoid Rationally Chemically Modified at any Position in the Conjugated Tail
作者:Yajie Wang、Johan Lugtenburg
DOI:10.1002/ejoc.200400488
日期:2004.12
that many more retinals chemically modified at the 12-position could be prepared in this manner. Selectfluor®, a good reagent for introducing a fluorine atom by electrophilic substitution, does not give the 12-fluororetinal system. However, 14-fluororetinal is simply available by reaction of the anion with Selectfluor®. Cl, Br and I atoms were also introduced at the 14-position of retinal both in the
在本文中,我们描述了如何通过亲电取代以简单的方式制备化学修饰的叶立德。随后的 Horner-Emmons 反应可以得到 (all-E)- 和 (11Z)-12-chloro-、-12-bromo- 和 -12-iodoretal。可以预期,以这种方式可以制备更多在 12 位进行化学修饰的视黄醛。Selectfluor® 是一种通过亲电取代引入氟原子的良好试剂,不会产生 12-氟视黄醛系统。然而,14-氟视黄醛可通过阴离子与 Selectfluor® 的反应轻松获得。Cl、Br 和 I 原子也以 (11Z,13Z)- 和 (13Z)-异构形式引入视黄醛的 14 位。这种策略可以扩展到整个范围的亲电取代反应。我们还开发了一种制备 4-羟基取代的 Horner-Emmons 衍生物的新方法,该方法可以通过与(二乙氨基)三氟化硫 (DAST) 反应转化为 4-氟衍生物。该系统可以简单地转化为 (all-E)-