Journal
ORGANIC LETTERS
Volume 9, Issue 4, Pages 723-726Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol063113h
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Funding
- NCI NIH HHS [R01 CA022215-27] Funding Source: Medline
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An operationally simple and efficient workup method for tetrabutylammonium fluoride (TBAF)-mediated t-butyldimethylsilyl (TBS) deprotection has been developed. The procedure includes addition of a sulfonic acid resin and calcium carbonate, followed by filtration and evaporation. This method eliminates the tedious aqueous-phase extraction process to remove excess TBAF and materials derived from TBAF, thereby making the protocol highly amenable to multiple TBS deprotections. Its efficiency and usefulness were demonstrated by using the transformation of 1a to 3a in the halichondrin synthesis.
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