A practical one-pot procedure for the synthesis of pyrazino[2′,3′:4,5]thieno[3,2-d]pyrimidinones by a tandem aza-Wittig/heterocumulene-mediated annulation strategy

1. Blanco, G.
2. Seguí, N.
3. Quintela, J.M.
4. Peinador, C.
5. Chas, M.
6. Toba, R.