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24744465698
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note
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Both antipodes of 9 are commercially available from Aldrich Chemical Co.: 9, catalog #33, 184-8; antipode of 9, catalog #33, 181-3.
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44
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16844386126
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Chan, C.; Heid, R.; Zheng, S.; Guo, J.; Zhou, B.; Furuuchi, T.; Danishefsky, S. J. J. Am. Chem. Soc. 2005, 127, 4596-4598.
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46
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24744440439
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note
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2D NOe analyses of compounds 29-32 were inconclusive in regards to establishing the respective configurations at C-21. However, the coupling constants (J's) between H-2) and H-13 were successfully measured for compounds 30 and 32 at 1.9 and 2.1 Hz, respectively. Based on dihedral angles derived from energy-minimized structures of 30 and 32 bearing both possible configurations at C-21, these J's were consistent with the respective assigned stereochemistries at this position.
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47
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0025770669
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Hartmann, B.; Kanazawa, A. M.; Depres, J.-P.; Green, A. E. Tetrahedron Lett. 1991, 32, 5077-5080.
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48
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24744467026
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note
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2O; (2) BoC2O, EtOH, room temperature; (3) Dess-Martin [O].
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49
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24744470369
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note
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2 (see Supporting Information).
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51
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24744452059
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note
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We were unable to acquire an authentic specimen of natural renieramycin G from Prof. B. S. Davidson (ref 5) with which to compare our synthetic sample. The isolation paper (ref 5) notes that the natural product was unstable. Furthermore, an optical rotation for this natural product has heretofore not been recorded.
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