Mm. Heravi et al., CLAISEN REARRANGEMENT, OF 3-(PROP-2-YNYLSULFANYL)-1,2,4-TRIAZINONE - A CONVENIENT ROUTE TO 2-METHYLTHIAZOLO[3,2-B][1,2,4]TRIAZINONE, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 37(6), 1998, pp. 590-592
6-Methyl-3- (prop-2-ynylsulfanyl)-1,2,4-triazin-5(2H)-one 1 on refluxi
ng with hexamethyl phophoric triamide (HMPT), in the presence of catal
ytic amount of PdCl2(PhCN)(2) affords 2,6-dimethylthiazolo [3,2-b][1,2
,4] triazin-7-one 10 via an interesting Claisen rearrangment. This str
ucture has been confirmed by unambiguous synthesis of 10.