p-Toluenesulfonic acid → N2-Methoxytrityl-9-[(2R)-2-deoxy-2-C-ethynyl-2-fluoro-5-O-tert-butyldimethylsilyl-3-O-tetrahydropyranyl-beta-D-erythro-pentofuranosyl]-guanine

Participants

Reaction Steps

To a stirred solution of 13 (0.8 mmol), in anh THF (20 ml/mmol), at room temperature, was added p-toluen sulfonic acid (0.12 mmol) and dihydropyran (2 ml/mmol). The reaction mixture was stirred at room temperature for 3 days and neutralized with TEA. The mixture was diluted with DCM, washed twice with H2O. The organic phase was dried over Na2SO4, filtered and evaporated. The crude material was purified by silica gel chromatography (DCM/MeOH) to yield the title compound. Molecular Formula C43H52FN5O6Si. Scan ES+ 780 (M+H)+

Provenance & Evidence