Fully Stereoselective Nucleophilic Addition to a Novel Chiral PyrrolineN-Oxide: Total Syntheses of (2S,3R)-3-Hydroxy-3-methylproline and Its (2R)-Epimer
作者:Pedro Merino、Julia Revuelta、Tomas Tejero、Stefano Cicchi、Andrea Goti
DOI:10.1002/ejoc.200300608
日期:2004.2
A new total synthesis of (2S,3R)-3-hydroxy-3-methylproline has been performed via a key intermediate chiral pyrroline N-oxide, obtained from (R)-citramalic acid. This nitrone underwent nucleophilic addition of furyllithium with complete stereoselectivity through a preferential attack anti to the methoxymethoxy group. The correct stereochemistry was established through an oxidation−reduction sequence
(2S,3R)-3-羟基-3-甲基脯氨酸的新全合成已通过关键中间体手性吡咯啉 N-氧化物进行,该中间体从 (R)-柠苹果酸获得。该硝酮通过抗甲氧基甲氧基的优先攻击以完全立体选择性进行呋喃基锂的亲核加成。正确的立体化学是通过氧化还原序列建立的,这允许在 C-2 处反转构型。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)