.write the mechanism for 7,8,EA compounds

Conditions: (d) DMDO, CHCl3, 23 C, 16 h, then AcOH, 62 C, 17 h, 78%; (e) cinnamic acid, 2,4,6trichlorobenzoyl chloride, Et3N, 4DMAP, CH2Cl2, 23 C, 5 h; (f) TBAF, AcOH (40 mol%), THF, 23 C, 1.5 h, 85% over 2 steps

b) K[OsC2(OH)4], (DHQD) PHAL, 73%a)2,PhSiH3 4 c) 5, pyridine 96% e) cinnamic acid