| http://www.w3.org/ns/prov#value | - As shown in Scheme 7, compounds of general formula 28 can be oxidized through conditions such as but not limited to oxalyl chloride, DMSO and triethyl amine; pyridinium chlorochromate; pyridinium dichromate and the like followed the treatment with (diethylamino)sulfur trifluoride (DAST) to provide compounds of general formula 29.
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