preparation i and 3 pyridineboronic acid the expected product is obtained in the form of a light brown powder with a yield of 66 by carrying out the operation analogously to example 2 starting from the product obtained according to example 21 3 3 pyridinyl phenyl 5 thio u03b2 d xylopyranoside is obtained in the form of a cream powder with a yield of 99 by carrying out the operation analogously to example 3 starting from 4 bromo 2 fluorophenyl 2 3 4 tri o acetyl 5 thio u03b2 d xylopyranoside obtained according to preparation vi and 3 pyridineboronic acid the expected product is obtained in the form of a white solid with a yield of 61 by carrying out the operation analogously to example 4 starting from the product obtained according to example 23 2 fluoro 4 3 pyridinyl phenyl 5 thio u03b2 d xylopyranoside is obtained in the form of a white solid with a yield of 73 by carrying out the operation analogously to example 3 starting from 4 bromo 2 fluorophenyl 2 3 4 tri o acetyl 5 thio u03b2 d xylopyranoside obtained according to preparation vi and 4 pyridineboronic acid the expected product is obtained in the form of a white solid with a yield of 51 by carrying out the operation analogously to example 4 starting with the product obtained according to example 25 2 fluoro 4 4 pyridinyl phenyl 5 thio u03b2 d xylo pyranoside is obtained in the form of a white solid with a yield of 73 by carrying out the operation analogously to example 3 starting from 2 bromo 5 fluoro phenyl 2 3 4 tri o acetyl 5 thio u03b2 d xylopyranoside obtained according to preparation v and 4 pyridineboronic.