P([O-])(O)(O)=O.[Na+].C(=O)(O)[O-].[Na+].[C:12]([O:15][CH:16]1[CH:23]2[CH:19]([O:20][CH2:21][CH2:22]2)[O:18][CH2:17]1)(=[O:14])[CH3:13].C(Cl)Cl>O>[C:12]([O:15][C@@H:16]1[C@H:23]2[C@H:19]([O:20][CH2:21][CH2:22]2)[O:18][CH2:17]1)(=[O:14])[CH3:13]
To the buffer solution (104.3 g of sodium dihydrogen orthophosphate dissolved in 530 mL of water & pH adjusted to 6.0-6.5 with saturated sodium bicarbonate solution (68 g in 680 mL water) solution) hexahydrofuro[2,3-b]furan-3-yl acetate (III, 115 g) and CAL-B (17.25 g) was added at 25-35° C., heated to 38-45° C. and stirred for 24 hours. CAL-B (17.25 g) was added stirred for 16 hours, again CAL-B (11.5 g) was added at 38-45° C. and stirred for 16 hours (pH should maintain 6.0-6.5). The reaction mass was cooled to 20-30° C., methylenedichloride (1150 mL) was added to the mass and stirred for 30 minutes. The reaction mass was filtered through hyflowbed then separated the organic layer and washed with 10% sodium chloride solution (575 mL). Organic layer was distilled completely under vacuum to get title compound II (yield 40.0 g).
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