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Order of Synthesis Steps to Avoid Protecting Groups

The same intermediate 13 has been also synthesized recently featuring the late introduction of the second hydroxyl group. This obviated the necessity to differentiate [Pg.227]

HO PMBCI PMBO (COCI)2, DMSO PMBO (EtOhPOCHjCOaEt OH [Pg.228]

Another synthesis of asteriscanolide was completed at about the same time [35], this time introducing oxygen functionality early and during the assembly of the [Pg.228]




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Group order

Group syntheses

Order of group

Order synthesis

Protecting groups, avoidance

Synthesis protection

Synthesis step

To Avoid

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