1-[1,7-dicarba-closo-dodecaboran(12)-1-yl]aldoses: Novel Boron Neutron Capture Candidates

Monolithiated 1,7-dicarba-closo-dodecaborane(12) reacts with O-isopropylidene derivatives of D-erythrono-1,4-lactone (1), L-mannono-1,4-lactone (3) and with tetra-O-trimethylsilylated D-glucono-1,5-lactone (2) and D-gulono-1,4-lactone (4) to give the title compounds after deprotection. An X-ray structure analysis of the protected L-mannofuranose carborane derivative 9 reveals that the more stable anomer has the β-L configuration.