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.
本发明涉及一种新的合成方法、中间体和前体,可导致化合物11和12的混合物。它还涉及对立体异构混合物的分离,以在实质上立体
化学纯度下提供化合物12。该发明的合成涉及制备化合物7和化合物10,如下所示,并将它们反应以制备化合物11和化合物12的混合物。