A new approach has been developed for construction of the western
 and eastern lactams, e.g. 2 and 3, needed for synthesis of
 isobacteriochlorins. It involves acylation of pyrroles with lactonic
 acids to form ketones. These are then efficiently converted into the
 desired lactams by a short sequence of reactions. All the steps are high
 yielding and simple to carry out.
                                    西部大开发走出一条新路子
 和东部内酰胺,例如2和3,合成所需
 异细菌二氢卟
酚。它涉及
吡咯与内酯的酰化
 酸形成酮。然后将它们有效地转换为
 通过一系列短反应生成所需的内酰胺。所有的台阶都很高
 产量高且易于实施。