Barclays Plc, Deutsche Bank AG and Standard Chartered Plc are in talks to lend between $600 million and $750 million collectively to Adani Group, as part of discussions to refinance the debt taken to fund its purchase Ambuja Cements Ltd.The loan would be syndicated who asked not be named as the matter is private. Gautam Adani’s conglomerate is also in discussions with other lenders, as it seeks to refinance as much as $3.8 billion of a loan facility taken for its Ambuja acquisition.