A new methodology for the preparation of 2-cyanopyrroles and synthesis of porphobilinogen
                                
                                    
                                        作者:Maciej Adamczyk、Rajarathnam E. Reddy                                    
                                    
                                        DOI:10.1016/0040-4020(96)00941-6
                                    
                                    
                                        日期:1996.11
                                    
                                    Condensation of α-acetoxynitro compounds 4a-f with isocyanoacetonitrile (5) using DBU in THF afforded 2-cyano-3,4-substituted pyrroles 6a-f, in good yield. Porphobilinogen (PBG, 12), the key building block for the preparation of tetrapyrrolic natural products, was synthesized from 2-cyano-3,4-substituted pyrrole 6f, in four steps.
                                    使用
DBU在THF中将α-乙酰氧基
硝基化合物4a-f与异
氰基
乙腈(5)缩合,以良好的产率得到2-
氰基-3,4-取代的
吡咯6a-f。
卟啉胆碱原(PBG,12)是制备四
吡咯天然产物的关键组成部分,它是由2-
氰基3,4-取代的
吡咯6f分四个步骤合成的。