PREPARATION OF NOVEL TRICYCLIC DIAZO CARBAPENEMS - APPLICATION OF INVERSE ELECTRON DEMAND DIELS-ALDER REACTIONS OF 3,6-BIS(METHYLTHIO)-1,2,4,5-TETRAZINE
Sm. Sakya et al., PREPARATION OF NOVEL TRICYCLIC DIAZO CARBAPENEMS - APPLICATION OF INVERSE ELECTRON DEMAND DIELS-ALDER REACTIONS OF 3,6-BIS(METHYLTHIO)-1,2,4,5-TETRAZINE, Tetrahedron letters, 38(34), 1997, pp. 5913-5916
The syntheses of novel tricyclic diazo carbapenem precursor 17, and th
e deprotected carbapenems 2 and 3 are described. The construction of t
he tricyclic carbapenem was accomplished by an intramolecular nucleoph
ilic substitution of the diazine sulfone 16 which was obtained from an
inverse electron demand Diels-Alder reaction of the alkynyl azetidino
ne 13 with 3,6-bis(methylthio)-1,2,4,5-tetrazine (4).