Improved yields of Benzoxepino- or Benzthiapino[4,3-b]pyrrole-2-acetic acids have been achieved from processes based on modifications performed on a pyrrole carboxylic ester rather than on a pyrrole-.alpha.-oxoacetate.
通过对
吡咯羧酸酯进行改性而非对
吡咯-α-氧
乙酸酯进行改性的过程,已经实现了苯并噁呔-或苯并噻呔[4,3-b]
吡咯-2-乙酸的提高产率。