Hoffmann's 1st generation synthesis of a masked triene monomer of disorazole C1. Reagents and conditions: (a) (R)-BINOL, Ti(Oi-Pr)4, 4Å MS, allyltributylstannane, CH2Cl2, −20 °C, 84%; (b) NaH, MeI, THF, 94%; (c) O3/O2, CH2Cl2, −78 °C, then PPh3, −78 °C to rt, 86%; (d) NaClO2, KH2PO4, H2O2, CH3CN/MeOH/H2O, 10 °C, 98%; (e) L-SerOMe·HCl, IBCF, NMM, THF, −25 °C to rt, 71%; (f) DAST, K2CO3, CH2Cl2, −78 °C; (g) DBU, BrCCl3, CH2Cl2, 0 °C to rt, 79% (over 2 steps); (h) H2, Pd/C, EtOH, 97%; (i) SO3·Pyr, Et3N, CH2Cl2/DMSO, 0 °C, 75%; (j) Br−Ph3P+CH2C≡CTMS, n-BuLi, THF, −78 °C to 0 °C, 49%; (k) K2CO3, MeOH, 77%; (l) 42, PdCl2(PPh3)2, CuI, Et3N, CH3CN, −20 °C to rt, 58%.