Synthetic Application of Sequential Palladium-Catalyzed Allylic Acetate Alkylation and Michael Addition Carbocyclization: Synthesis of (±)-Dihydroerythramine
作者:Céline Jousse-Karinthi、Claude Riche、Angèle Chiaroni、Didier Desmaële
DOI:10.1002/1099-0690(200110)2001:19<3631::aid-ejoc3631>3.0.co;2-8
日期:2001.10
(Nitromethyl)arene 3 underwent a palladium-catalyzed annulation reaction with allylic acetate 11 to provide nitro esters 12a and 12b by an (η3-allyl)palladium complex alkylation/Michael addition domino sequence. Reduction of the nitro group of 12a, followed by cyclization of the resulting amino group on the acetate appendage, afforded the bicyclic lactam 29. Two-carbon elongation at the nitrogen atom of 29 by hetero
报道了一种合成芳香刺桐生物碱的新途径。(硝基甲基)芳烃 3 与乙酸烯丙酯 11 进行钯催化的环化反应,通过(η3-烯丙基)钯配合物烷基化/迈克尔加成多米诺骨牌序列提供硝基酯 12a 和 12b。将 12a 的硝基还原,然后将所得氨基在乙酸酯附属物上环化,得到双环内酰胺 29。通过乙烯基苯基亚砜的杂迈克尔加成,接着是 Pummerer-,在 29 的氮原子处发生双碳延伸型环化,得到 cis-11-phenylthioerythrinan-8-one (32a, 32b) 以及重排的内酰胺 34。C-11 处的还原脱硫和 C-3 环外双键的氧化裂解得到 15,16-(亚甲二氧基)erythrinan-3,8-dione (42)。