This invention relates to a new synthesis, intermediates and precursors leading to a mixture of the compounds 11 and 12 as shown below. It also relates to the resolution of the stereoisomeric mixture to provide in substantial stereochemical purity compound 12. The synthesis of the invention involves preparation of compound 7 and compound 10 as shown below and their reaction to prepare a mixture of compound 11 and compound 12.
这项发明涉及一种新的合成方法,中间体和前体,导致如下所示的化合物11和12的混合物。它还涉及对立体异构物混合物进行分离,以在实质上的立体
化学纯度中提供化合物12。该发明的合成涉及制备如下所示的化合物7和化合物10,以及它们的反应以制备化合物11和化合物12的混合物。