Singh, Harjit published the artcileSynthesis of heterocyclic compounds via enamines. Part 8. Acid-catalyzed transformations in 4,4,6-trimethyl-1,4-dihydropyrimidine-2(3H)-thione derivatives and related compounds, Formula: C5H10N2OS, the publication is Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) (1980), 1013-18, database is CAplus.
The N-substituted trimethylpyrimidinethiones I (R = alkyl, alkenyl, Ph) were converted into the corresponding N-substituted 1,3-thiazines II and/or thioureas by heating in 11M HCl at 100-10°. However at 95-100°, Dimroth rearrangement products, e.g. the N-substituted thiazines III (R = alkyl, alkenyl, Ph), were formed. Thus, I (R = Me) (IV) in 11M HCl at 100-10° for 4 h gave 90% methylthiourea. IV in 11M HCl at 95-100° for 2.5 h gave 98% III (R = Me).
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999) published new progress about 14294-10-1. 14294-10-1 belongs to amides-buliding-blocks, auxiliary class Morpholine,Thiourea,Amine,Amide, name is Morpholine-4-carbothioamide, and the molecular formula is C18H34N4O5S, Formula: C5H10N2OS.
Referemce:
https://en.wikipedia.org/wiki/Amide,
Amide – an overview | ScienceDirect Topics