@article{oai:kanazawa-u.repo.nii.ac.jp:00010673,
 author = {Ngwe, Hla and Kinoshita, Hideki and Inomata, Katsuhiko},
 issue = {12},
 journal = {Bulletin of the Chemical Society of Japan},
 month = {Jan},
 note = {Diethyl 3,4-disubstituted 1,5-dihydro-5-oxo-2H-pyrrol-2-ylphosphonates were regioselectively prepared by acidic hydrolysis of diethyl 3,4-disubstituted 5-bromo-2-pyrrolylphosphonates. The resulting 1,5-dihydro-2H-pyrrol-2-ones 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.},
 pages = {3320--3326},
 title = {Regioselective Preparation of Diethyl 3,4-Disubstituted 1,5-Dihydro-5-oxo-2H-pyrrol-2-ylphosphonates and Their Coupling with Aldehydes. Application to the Synthesis of C/D-Rings Component of Phycocyanobilin},
 volume = {67},
 year = {1994}
}