Catalytic asymmetric aza Diels–Alder reactions of hydrazones using a chiral zirconium catalyst
作者:Yasuhiro Yamashita、Yumiko Mizuki、Shū Kobayashi
DOI:10.1016/j.tetlet.2005.01.111
日期:2005.3
Catalytic asymmetric aza Diels–Alder reactions of acylhydrazones with Danishefsky’s dienes have been developed. A chiral zirconium complex derived from zirconium propoxide and 3,3′,6,6′-I4BINOL was found to be effective in this reaction, and the desired optically active 2,3-dihydro-4-pyridone derivatives were obtained with high enantioselectivities. Asymmetric formal synthesis of a natural product
已开发了酰基hydr与Danishefsky二烯的催化不对称氮杂Diels-Alder反应。已发现衍生自丙氧化锆和3,3',6,6'-I 4 BINOL的手性锆络合物在该反应中有效,并以高收率获得了所需的旋光性2,3-二氢-4-吡啶酮衍生物对映选择性。使用该催化不对称反应作为关键步骤,进行了天然产物香氨酸的不对称形式合成。