Formaldehyde → HCID 19748777, compound

Participants

Reaction Steps

A mixture of 273 mg (0.94 mmol) azetidinone from Step A, 26.3 mg paraformaldehyd and 178 mg (0.56 mmole) cesium carbonate was stirred in 20 ml dry tetrahydrofuran at ambient temperature 16.5 hours under nitrogen. A mixture of 430 μl pyridine and 2.56 ml acetic anhydride was added to the reaction mixture and the stirring continued 5 more hours. The solvents were evaporated in vacuo to give 604 mg crude product which was chromatographed on a silica gel flash column in hexane-ethyl acetate 3/1. This gave 102 mg (30%) of 1-acetoxymethyl-4-p-nitrophenylthio-3-n-propylazetidin-2-one.

Provenance & Evidence