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Reagents: (a) Ti(OiPr)4, NaBH(OAc)3, THF, 35%; (b) TFA, DCM 85%, 39%; (c) BH3·Me2S, THF, 90%; (d) (COCl)2, DMSO, Et3N, CH2Cl2, 63%; (e) NaBH(OAc)3, 1,2-DCE, 3, 77%; (f) NaBH(OAc)3, 1,2-DCE, 6, 51%; (g) TFA, DCM, 39%.
