1,3,5-Trioxane → HCID 54268323, compound

Participants

Reaction Steps

1 M of titanium tetrachloride in DCM (43 mL) was added to a solution of intermediate (7b) (12.7 g, 41 mmol) in DCM (150 mL) at 0° C. under nitrogen. After 20 minutes, DIPEA (7.9 mL, 45.2 mmol) was added dropwise at 0° C. After 80 minutes, 1,3,5-trioxane (4.1 g, 45.2 mmol) in DCM (30 mL) was added, followed by a second equivalent of 1 M titanium tetrachloride in DCM after 10 minutes. After 2.5 hours at 0° C., the mixture was quenched with saturated aqueous NH4Cl (150 mL). The product was extracted with water (100 mL) and DCM (3×200 mL). The combined organic extracts were dried over Na2SO4, filtered, and concentrated in vacuo to yield intermediate (7c), which was used in the next step without further purification.

Provenance & Evidence