国家自然科学基金81102335;上海市科委启明星计划11QA1408200;上海活性天然产物制备工程技术研究中心10DZ2251300.Supported by National Natural Science Foundation of China81102335;Rising Star Plan of Shanghai Science and Technology Committee11QA1408200;Shanghai Engineering Research Center for the Preparation of Bioactive Natural Products10DZ2251300