Scheme 4. Cyclization of Per Hydroxy Ketone 11 vs C(5)- Hydroxy Ketone 10 Method A desired 6-ring cyclization OH OH 4 HO. 5 ОН ОН CI 11 undesired 5-ring cyclization Method B desired 6-ring cyclization CI OH "OH HO "OH OH 12 CI HO OH HO OH OH 13 CI OAC OH OAC O AcO 5 OAC OAC - OH ACO "OAC CI OAC 10 14 12

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