NOVELTY - Synthesis of carbapenem antibiotic parent nucleus MAP involves adding tosyl azide to 4-mercaptobenzoic acid, dichloromethane, 1,1'-carbonyldiimidazole and anhydrous magnesium salt, heating, adding isopropanol, cooling, separating solid and liquid, obtaining intermediate (B), adding to acetone and water, reacting, filtering, obtaining intermediate (C), heating intermediate (C), ethyl acetate and rhodium octanoate, dripping diphenyloxyphosphoryloxy chloride and diisopropylethylamine, adding diphenyloxyphosphoryloxy chloride to organic layer, separating organic layer, and filtering.    USE - Synthesis of carbapenem antibiotic parent nucleus MAP (claimed).    ADVANTAGE - The method enables economical and environmentally-friendly synthesis of carbapenem antibiotic parent nucleus MAP with high efficiency and reduced energy consumption, under low reaction conditions.    DETAILED DESCRIPTION - Synthesis of carbapenem antibiotic parent nucleus MAP involves adding mono-p-nitrobenzyl alcohol malonate, dichloromethane, anhydrous magnesium chloride and triethylamine to a reactor, reacting, obtaining anhydrous magnesium salt, adding 4-mercaptobenzoic acid, dichloromethane, 1,1'-carbonyldiimidazole and anhydrous magnesium salt to reactor, adding hydrochloric acid, cooling, stirring, leaving still, separating organic layer, obtaining organic solution of intermediate (A), adding tosyl azide, reacting, heating, concentrating, adding isopropanol, cooling, crystallizing, separating solid and liquid, obtaining intermediate (B), adding intermediate (B) to acetone and water, heating, reacting, adjusting pH using sodium hydroxide solution, distilling under reduced pressure, filtering, obtaining filter cake as intermediate (C), adding intermediate (C), ethyl acetate and rhodium octanoate catalyst to a reactor, heating, cooling, dripping diphenyloxyphosphoryloxy chloride and diisopropylethylamine, stirring, stratifying, adding diphenyloxyphosphoryloxy chloride to organic layer, reacting, separating organic layer, crystallizing, and filtering.