HYDRIDE TRANSFER REACTIONS OF 5-(2-ALKOHYBENZYLIDENE) BARBITURIC ACIDS: SYNTHESIS OF 2,4,6-TRIOXOPERHYDROPYRIMIDINE-5-SPIRO-30-CHROMANES Статья Krasnov K.A., Dorovatovskii P.V., Zubavichus Y.V., Timofeeva T.V., Khrustalev V.N. Tetrahedron. 2017. С. 542-549