Tetrabutylammonium Fluoride → ethyl (1S,1aS,6bR)-5-hydroxy-1a,6b-dihydro-1H-cyclopropa[b]benzofuran-1-carboxylate

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Reaction Steps

Tetra-n-butylammonium fluoride (TBAF, 1M in THF, 4 mmol) was added dropwise to a solution of the product of Step A (7.3 g, crude) in THF (100 mL) at 0° C. The reaction was stirred at RT for 30 min. The mixture was concentrated and purified by column chromatography to afford the title compound as a solid (2.52 g, 57% for 2 steps, 72% ee).

Provenance & Evidence