FIRST EXAMPLE OF LONG DISTANCE STEREOCONTROLLED SYNTHESIS IN 1-AZA-3,7- DIOXABICYCLO[3.3.0.]OCTANE SERIES
作者:Carmen Maiereanu、Mircea Darabantu、Eric Condamine、Gérard Ρlé、Yvan Ramondenc、Marijana Fazekas、Monica Pintea、Camelia Berghian
DOI:10.1515/hc.2005.11.3-4.305
日期:2005.1
first example of a long distance stereocontrolled synthesis of this type of structure. The thermodynamic control of the reaction together with complete NMR evidence to support the stereochemistry of this compound are discussed. INTRODUCTION The l-aza-3,7-dioxabicyclo[3.3.0]octane heterocyclic saturated system A (Scheme 1) as an easily available analogue of the core alkaloid pyrolizidine Β is known
(lÄ*J'5*,2S*,2'Ä*>55*,5'Ä*,8Ä*,8'5*)-bis-l,4-l-aza-5-的非对映选择性合成甲基-8-(4-硝基苯基)-3,7-二氧杂双环[3.3.0]辛烷-2-基}苯被描述为此类结构的长距离立体控制合成的第一个例子。讨论了反应的热力学控制以及完整的 NMR 证据,以支持该化合物的立体化学。引言 l-aza-3,7-dioxabicyclo[3.3.0]octane 杂环饱和系统 A(方案 1)作为核心生物碱吡咯里西啶 Β 的一种容易获得的类似物,自 Senkus (1,2) 的开创性工作以来就已为人所知,皮尔斯 (3, 4) 和伯格曼 (5)。4 ^ 6 4 6 3 0 5 1 θ 7 3< 1,1 2 φ 8 2 φ 8