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. Author manuscript; available in PMC: 2010 Apr 19.
Published in final edited form as: Chem Rev. 2008 May 20;108(6):1982–2014. doi: 10.1021/cr078198u

Scheme 9.a.

Scheme 9.a

a Reagents and conditions: (a) Ac2O, DMAP, py; (b) H2O, py, reflux; (c) i-Pr2NP(OBn)2, tetrazole, CH2Cl2; MCPBA, CH2Cl2; (d) (BnO)2P(O)H, DIPEA, DMAP, CCl4/MeCN; (e) H2, 10% Pd/C, ethanol; NaOH, H2O; (f) NaOMe, HOMe; H2, 10% Pd/C, ethanol; NaOMe, HOMe.