The present invention discloses the process for preparation of (2S,3R,4R,5S,6R)- 2-[4-chloro-3-(4-ethoxybenzyl)phenyl]-6-(hydroxymethyl)tetrahydro-2H-pyran- 3,4,5-trioland its amorphous form. The invention further discloses novelco- crystals of dapagliflozin,and process for preparation thereof. The invention further discloses novel intermediateAcetic acid 4,5-diacetoxy-6-acetoxymethyl-2-R1-2- [4-chloro-3-(4-ethoxy-benzyl)-phenyl]-tetrahydro-pyran-3-yl ester, wherein R1 is allyl or 2-prop-2ynyl useful for preparation 2-R1-2-[4-Chloro-3-(4-ethoxy- benzyl)-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triol.
本发明揭示了制备(2S,3R,4R,5S,6R)-2-[4-
氯-3-(4-乙氧基苯基)苄基]苯基]-6-(羟甲基)四氢-
2H-吡喃-3,4,5-三醇及其非晶态形式的过程。本发明还揭示了
达格列净的新型共晶体及其制备方法。本发明还揭示了新型中间体
乙酸4,5-
二乙酰氧基-6-乙酰氧甲基-2-R1-2-[4-
氯-3-(4-乙氧基苯基)苄基]-四氢-
吡喃-3-基酯,其中R1为烯丙基或2-丙-2-炔基,用于制备2-R1-2-[4-
氯-3-(4-乙氧基苯基)苄基]-6-羟甲基-四氢-
吡喃-3,4,5-三醇。