A novel strategy based on phase transfer catalysis for the diastereoselective and enantioselective direct assembly of unsymmetric β,β-diaryl-α-amino acid esters via 1,6-conjugate addition of para-quinone methides and glycine derivatives is described. This protocol also provides an alternative route to the synthetically interesting functionalized chiral tetrahydroisoquinoline and its analogues.
描述了一种基于相转移催化的非对称β,β-二芳基-
α-氨基酸酯的非对映选择性和对映选择性直接组装反应的新策略,该过程通过
对苯醌甲基化物和甘
氨酸衍
生物的1,6-共轭添加。该协议还为合成有趣的功能化手性
四氢异喹啉及其类似物提供了另一种途径。