The present disclosure provides a method of preparing a compound of Formula I, wherein R1 is C1-C4 alkyl; R2 is C1-C4 alkyl; and R3 is selected from the group consisting of C1-C6 alkyl, (aryl)alkyl, and (heteroaryl)alkyl in >95% chemical purity and >95% enantiomeric excess.
本公开提供了一种制备化合物I的方法,其中R1为C1-C4烷基;R2为C1-C4烷基;R3从C1-C6烷基、(芳基)烷基和(杂环芳基)烷基组成的群体中选择,在>95%的
化学纯度和>95%的对映体过量下。