We report here a new widely useful and applicable preparation of functionalised 6H-1,3-thiazinic cycloadducts, versatile key intermediates in the total multistep syntheses of 7-methoxycephems (as analogues of 7-methoxycephalosporins).
DUGUAY G.; GUEMAS J.-P.; MESLIN J.-C.; PRADERE J.-P.; RELIQUET F.; RELIQU+, J. HETEROCYCL. CHEM., 1980, 17, NO 4, 767-770