Bidirectional Synthesis of Di-<i>tert</i>-butyl (2<i>S</i>,6<i>S</i>,8<i>S</i>)- and (2<i>R</i>,6<i>R</i>,8<i>R</i>)-1,7-Diazaspiro[5.5]undecane-2,8-dicarboxylate and Related Spirodiamines
作者:Joshua Almond-Thynne、Jiaxu Han、Andrew J. P. White、Anastasios Polyzos、Philip J. Parsons、Anthony G. M. Barrett
DOI:10.1021/acs.joc.8b00794
日期:2018.6.15
The key transformation was the conversion of Boc-protected tert-butyl aspartate into the derived aldehyde, two-directional Horner–Wadsworth–Emmons olefination, hydrogenation, and selective acid-catalyzed Boc-deprotection and spirocyclization. An alternative, two-directional approach to derivatives of 1,7-diazaspiro[5.5]undecane is described.
描述了由(l)-和(d)-天冬氨酸有效合成螺二胺二酯的两种对映体。关键的转化是将Boc保护的天冬氨酸叔丁酯转化为衍生的醛,进行双向Horner-Wadsworth-Emmons烯化,加氢以及选择性酸催化的Boc脱保护和螺环化。描述了一种1,7-二氮杂螺[5.5]十一烷衍生物的双向替代方法。