作者:Salvador Gil、Mercedes Torres、Natalia Ortúzar、Richard Wincewicz、Margarita Parra
DOI:10.1002/ejoc.200300795
日期:2004.5
We report new conditions to facilitate the addition of dianions of carboxylic acids to epoxides as an alternative method to the use of aluminum enolates. These conditions require the use of a sub-stoichiometric (10%) amount of amine for dianion generation and the previous activation of the epoxide with LiCl. Other Lewis acids have been shown to be less effective. Yields are good but only low diastereoselectivity
我们报告了新的条件,以促进将羧酸的二价阴离子添加到环氧化物中,作为使用铝烯醇化物的替代方法。这些条件需要使用亚化学计量 (10%) 量的胺来生成二价阴离子并预先用 LiCl 活化环氧化物。其他路易斯酸已被证明效果较差。产率良好,但仅获得了低的非对映选择性,尽管进行了优化尝试,但仍未得到控制。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)