of α,β-disubstitutednitroalkenes with bifunctional organocatalyst has been developed. The expected adducts could be obtained in high yields with reasonable diastereo- and enantioselectivities. This process provides an easy access to synthetically useful chiral 1,2-aminothiol derivatives bearing two vicinal stereocenters. Importantly, current work represents the first example about the catalytic asymmetric
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.
Ring Closure of Nitroalkylmalonates for the Synthesis of Isoxazolines under the Acylation Conditions
作者:Yulia A. Antonova、Yulia V. Nelyubina、Sema L. Ioffe、Alexey Yu. Sukhorukov、Andrey A. Tabolin
DOI:10.1002/adsc.202200420
日期:2022.8.2
alkyl, and ester) at the C3 and C4 positions of the resulting isoxazolines were also tolerated. A quick assembly of the isoxazoline ring starting from nitroalkenes and malonates was successfully developed. Control experiments showed that the intramolecular ringclosure is the most likely key mechanistic step. Subsequent transformations into pyrrolidine and furane derivatives demonstrated the synthetic