Synthesis of a <i>cis</i> 2,5-Disubstituted Morpholine by De-epimerization: Application to the Multigram Scale Synthesis of a Mineralocorticoid Antagonist
作者:Matthew Sammons、Sandra M. Jennings、Michael Herr、Catherine A. Hulford、Liuqing Wei、James F. Hallissey、E. Jason Kiser、Stephen W. Wright、David W. Piotrowski
DOI:10.1021/op400101p
日期:2013.6.21
A convergent route to multigram quantities of a mineralocorticoid antagonist 3 is described. Starting from (R)-phenylglycinol, the synthesis of cis 2,5-morpholine 2 is accomplished utilizing a de-epimerization to install the second stereogenic center. The multigram synthesis of 3 was completed through a sequence of an SNAr reaction, Dakin oxidation, alkylation, and cyclization to provide a crystalline solid.