A Facile Synthesis of Lentiginosine Analogues Based on a Highly Regio- and Diastereoselective Allylic Amination Using Chlorosulfonyl Isocyanate
作者:In Su Kim、Qing Ri Li、Guang Ri Dong、Yoo Chang Kim、Yeon Ju Hong、Momi Lee、Ki-Whan Chi、Joa Sub Oh、Young Hoon Jung
DOI:10.1002/ejoc.200901443
日期:2010.3
compounds 2 and 3, was synthesized by the regio- and diastereoselective amination of anti-3,4-tribenzyl ether 7 using chlorosulfonyl isocyanate. The reaction of 7 with chlorosulfonyl isocyanate in toluene at 0 °C afforded 6 exclusively with a diastereoselectivity of 26:1 in 84 % yield. These results can be explained by the neighboring-group effect, which leads to retention of the stereochemistry.
豌豆苷类似物吡咯里西啶生物碱 2 和吡咯氮杂生物碱 3 的简明合成是从廉价且容易获得的 D-来苏糖中实现的。合成中的关键步骤包括区域选择性和非对映选择性胺化、分子间或分子内烯烃复分解以及 Appel 环化。制备标题化合物 2 和 3 所必需的抗 3,4-氨基醇 6 是通过使用氯磺酰基异氰酸酯对抗 3,4-三苄基醚 7 进行区域选择性和非对映选择性胺化来合成的。7 与氯磺酰基异氰酸酯在甲苯中在 0°C 下反应,以 84% 的收率专门提供 6,非对映选择性为 26:1。这些结果可以通过相邻基团效应来解释,这导致立体化学的保留。