in benzene T=90°C; Wittig reaction; 1.5 h;

1: 2-(Diethoxy-phosphoryl)-propionic acid ethyl ester With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; Inert atmosphere; 2: tetrahydropyran-2-one With diisobutylaluminium hydride in tetrahydrofuran; hexane T=-78°C; Inert atmosphereWarming; 3: With water; ammonium chloride in tetrahydrofuran; hexane optical yield given as percent de;

manganese(IV) oxide in dichloromethane T=20°C; Wittig olefination; 24 h;

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