Design and Synthesis of Pyrido[2,1-b][1,3,5]thiadiazine Library via Uncatalyzed Mannich-Type Reaction
摘要:
This Research Article describes the synthesis of an over 700-member library of (8R/8S)-3-R-8-aryl-6-oxo-3,4,7,8-tetrahydro-2H,6H-pyrido[2,1-b][1,3,5]thiadiazin-9-carbonitriles by uncatalyzed Mannich-type reaction of N-methylmorpholinium (4R/4S)-4-aryl-3-cyano-6-oxo-1,4,5,6-tetrahydropyridin-2-thiolates with a set of primary amines and excessive HCHO. The scope and limitations of the reaction were studied. Starting thiolates were obtained in yields of 53-82% by multicomponent reaction of aromatic aldehydes, cyanothioacetamide, 2,2-dimethyl-1,3-dioxane-4,6-dione (Meldrum's acid), and N-methylmorpholine, followed by heterocyclization of the resulting Michael adducts.
Multicomponent Synthesis of Functionalized 2-Amino-4H-pyrans Initiated by the Knoevenagel Reaction
作者:I. V. Dyachenko、V. D. Dyachenko、P. V. Dorovatovskii、V. N. Khrustalev、V. G. Nenajdenko
DOI:10.1134/s1070428023020057
日期:2023.2
Abstract The multicomponent condensation of aldehydes, malononitrile derivatives, 1,3-dicarbonyl compounds of the carbo- and heterocyclic series, and alkylhalides has been studied. The transformation is initiated by the Knoevenagel reaction and leads to the formation of functionally substituted fused 2-amino-4H-pyrans. The structure of a few products was studied by X-ray diffraction (XRD) analysis
摘要 已经研究了醛、丙二腈衍生物、碳环和杂环系列的 1,3-二羰基化合物以及卤代烷的多组分缩合。该转化由 Knoevenagel 反应启动,并导致形成功能取代的稠合 2-amino-4 H -pyrans。通过 X 射线衍射 (XRD) 分析研究了一些产品的结构。
Elgemeie, Galal E. H.; Alnaimi, Ibrahim S.; Gawad, Mona A., Journal of Chemical Research, Miniprint, 1995, # 2, p. 424 - 433
作者:Elgemeie, Galal E. H.、Alnaimi, Ibrahim S.、Gawad, Mona A.