Welkstoffe und Antibiotika. 40. Mitteilung [1]. Synthesen von Dehydroorchinol-methyläther und Dehydroorchinol
作者:Peter Müller、Josef Seres、Kurt Steiner、Salah E. Helali、Emil Hardegger
DOI:10.1002/hlca.19740570333
日期:1974.4.27
Die analytisch ermittelte Struktur des Orchinols als 2,4-Dimethoxy-7-hydroxy-9,10-dihydrophenanthren wurde durch Synthese des Dehydroorchinol-methyläthers (2,4,7-Trimethoxyphenanthren) VIIIa und des Dehydroorchinols (2,4-Dimethoxy-7-hydroxyphenanthren) VIIIc eindeutig bestätigt.
二羟基苯甲酸酯分析2,4-二甲氧基-7-羟基-9,10-二氢菲蒽合成(2,4,7-三甲氧基菲)VIIIa and des Dehydroorchinols(2,4-Dimethoxy-7 -羟基菲蒽(VIIIc eindeutigbestätigt)。
作者:Merritt B. Andrus、Kaid C. Harper、Michael A. Christiansen、Meisha A. Binkley
DOI:10.1016/j.tetlet.2009.05.090
日期:2009.8
Phenethyl arylacetates are alkylated under phase-transfer conditions with cinchona catalysts with alkyl halides in high yield with excellent enantioselectivity (84-99% ee) following recrystallization. Cinchonidine (CD) derived catalyst gave the (R)-product and cinchonine (CN) catalyst produced the (S)-product. The phenethyl (PE) ester group is removed, using ammonium formate and catalytic Pd/C, to give alkylated carboxylic acid products in high selectivity. The utility of the approach is demonstrated by a direct synthesis of (S)-naproxen(TM). (C) 2009 Elsevier Ltd. All rights reserved.