manganese(IV) oxide; N-bromosuccinmide in dichloromethane 10 h; Sonication; optical yield given as percent destereoselective reaction;

1: (EtO)2POCHBrCO2Et With 18-crown-6 ether; potassium tert-butylate in tetrahydrofuran; acetonitrile T=-78°C; Deprotonation; 0.5 h; 2: cyclohexanecarbaldehyde in tetrahydrofuran; acetonitrile T=-40°C; Horner-Wadsworth-Emmons reaction; 5 h;

Grubb's 2nd generation catalyst in dichloromethane 12 h; Heating;

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Wittig reaction;