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With Dess-Martin periodane; In dichloromethane; for 24h;
EXAMPLE 7C A solution of EXAMPLE 7B (1.14 g) and Dess-Martin reagent (3.4 g) in dichloromethane (25 mL) was stirred for 24 hours, filtered and concentrated. The concentrate was flash chromatographed on silica gel with 10% ethyl acetete/hexanes.
With pyridinium chlorochromate; In dichloromethane; at 20℃; for 12h;Molecular sieve;
[675] To a suspension of 173A and molecular sieves (powdered, activated, 4A) in DCM was added PCC (10 mmol). After stirring for 12 hr at RT, the reaction was filtered through silica gel, and concentrated to give crude aldehyde 173B, which was used for the next step without purification.