Tandem hetero-Diels–Alder-hemiacetal reaction in the synthesis of new chromeno[4′,3′:4,5]thiopyrano[2,3-<i>d</i>]thiazoles
作者:Andrii Lozynskyi、Vasyl Matiychuk、Olexandr Karpenko、Andrzej K. Gzella、Roman Lesyk
DOI:10.1515/hc-2016-0176
日期:2017.2.1
Abstract Novel rel-(5aR,6R,11bS)-6-hydroxy-3,5a,6,11b-tetrahydro-2H,5H-chromeno[4′,3′:4,5]thiopyrano[2,3-d][1,3]thiazole-2-ones were synthesized via tandem hetero-Diels-Alder-hemiacetal reaction of 5-(2-hydroxybenzylidene)-4-thioxo-2-thiazolidinones and α,β-unsaturated aldehydes. The stereochemistry of cycloadditions was confirmed by NMR spectra and a single crystal X-ray diffraction analysis.
摘要 新型rel-(5aR,6R,11bS)-6-hydroxy-3,5a,6,11b-tetrahydro-2H,5H-chromeno[4',3':4,5]thiopyrano[2,3-d] [1,3] thiazole-2-ones 是通过 5-(2-hydroxybenzylidene)-4-thioxo-2-thiazolidinones 和 α,β-不饱和醛的串联杂-Diels-Alder-半缩醛反应合成的。通过核磁共振谱和单晶 X 射线衍射分析证实了环加成的立体化学。