The invention relates to improved methods of preparing dihydrothienopyrimidines of formula 1, and intermediates thereof, (I) wherein X is SO or SO2, preferably SO, and wherein RA, R1, R2, R3, R4 and R5 have the meanings given in the description. The methods according to this invention are more suitable for large-scale synthesis of said compounds than prior methods because the new synthetic process avoids distillation and chromatographic purification between steps and results in a higher overall yield of the desired product.
本发明涉及改进的制备式1的二氢噻
嘧啶及其中间体的方法,其中X为SO或SO2,优选为SO,RA、R1、R2、R3、R4和R5的含义如说明书所述。本发明的方法比现有方法更适合大规模合成所述化合物,因为新的合成过程避免了步骤之间的蒸馏和色谱纯化,并且导致所需产物的总收率更高。