I would like to prepare thioester of (2-aminothiozolyl )-2-methoxycarbonyl-methoxyimino-3-oxobutanoic acid with Dibenzothiozole disyulphide,using
Triethylphosphite as catalyst/oxygen scavenger.Could any one please help me with operating parameters to get highest yield without any residue of TEP
oxide in the product.