[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([CH3:8])[C:3]=1[S:9](Cl)(=[O:11])=[O:10].[OH:13][CH2:14][P:15](=[O:24])([O:20][CH:21]([CH3:23])[CH3:22])[O:16][CH:17]([CH3:19])[CH3:18].C(N(CC)CC)C>CCOCC.C(OCC)(=O)C>[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([CH3:8])[C:3]=1[S:9]([O:13][CH2:14][P:15](=[O:24])([O:16][CH:17]([CH3:19])[CH3:18])[O:20][CH:21]([CH3:23])[CH3:22])(=[O:10])=[O:11]A solution of 21.7 g of 2-chloro-6-methylbenzenesulfonyl chloride dissolved in 40 ml of ether was added dropwise over 90 minutes to a mixture of 20.6 g of diisopropyl P-(hydroxymethyl)-phosphonate, (Example 17), 80 ml of ether, and 15.4 ml of triethylamine. The addition was mildly exothermic and the reaction was cooled using a cool water bath (no ice). The reaction was allowed to stir overnight at room temperature and then was diluted with 300 ml of ethyl acetate, washed with three 100 ml portions of water, the organic phase dried with magnesium sulfate, filtered and concentrated under reduced pressure to yield 34.0 g of the desired product as a yellow oil.
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