Abstract
A convenient chemoenzymatic strategy for synthesizing sialosides containing a C5-diversified sialic acid was developed. The alpha 2,3- and alpha 2,6-linked sialosides containing a 5-azido neuraminic acid synthesized by a highly efficient one-pot three-enzyme approach were converted to C5 ''-amino sialosides, which were used as common intermediates for chemical parallel synthesis to quickly generate a series of sialosides containing various sialic acid forms. (C) 2009 Elsevier Ltd. All rights reserved.