Regioselective Preparation of Diethyl 3,4-Disubstituted 1,5-Dihydro-5-oxo-2<i>H</i>-pyrrol-2-ylphosphonates and Their Coupling with Aldehydes. Application to the Synthesis of C/D-Rings Component of Phycocyanobilin
作者:Hla Ngwe、Hideki Kinoshita、Katsuhiko Inomata
DOI:10.1246/bcsj.67.3320
日期:1994.12
readily underwent the coupling reaction with various aldehydes to afford the corresponding 1,5-dihydro-5-methylene-2H-pyrrol-2-ones including pyrromethenone derivatives in good yields. A series of these reactions was successfully applied to the synthesis of C/D-rings component of phycocyanobilin.
3,4-二取代的 1,5-二氢-5-氧代-2H-吡咯-2-基膦酸二乙酯通过 3,4-二取代的 5-溴-2-吡咯基膦酸二乙酯的酸水解进行区域选择性制备。得到的 1,5-二氢-2H-吡咯-2-酮很容易与各种醛进行偶联反应,以良好的收率得到相应的 1,5-二氢-5-亚甲基-2H-吡咯-2-酮,包括吡咯甲酮衍生物. 这一系列反应成功地应用于藻蓝胆素C/D环组分的合成。