Diastereoselective 1,6-asymmetric induction to chiral 4-hydroxyethylaminobutanones by using methyltitanium triisopropoxide.
作者:Hiroshi TAKAHASHI、Kazuo HATTORI、Kimio HIGASHIYAMA、Yumiko UENO
DOI:10.1248/cpb.38.1062
日期:——
The reactions of (S)-4-amino-1-phenylbutanones (3a-e) with methyllithium, methylmagnesium bromide, and methyltitanium triisopropoxide were studied. The reaction of the (S)-4-hydroxyethylamino derivatives (3a and 3d) with methyltitanium triisopropoxide gave 4a and 4d by 1, 6-asymmetric induction with diastereoselectivities of 78 and 70%.
研究了(S)-4-氨基-1-苯基丁酮(3a-e)与锂甲基、溴化甲基镁和三异丙氧化钛甲基的反应。与三异丙氧化钛甲基反应的(S)-4-羟乙基氨基衍生物(3a和3d)通过1,6不对称诱导生成4a和4d,立体选择性分别为78%和70%。