Photoreduction des esters car☐yliques dans l'hexamethylphosphortriamide (HMPT)
作者:C. Portella、H. Deshayes、J.P. Pete、D. Scholler
DOI:10.1016/s0040-4020(01)88794-9
日期:1984.1
Use of HMPT as solvent in photochemistry allows efficient photoreductions. Alkyl esters and especially non absorbing alkyl acetates are photoreduced in excellent yields into alkanes. In the latter case, a protonating agent is necessary. Numerous examples illustrate the generality and convenience of the reaction. This photoreduction involves an electron transfer from HMPT to ester.
Synthesis of specifically deoxygenated disaccharide derivatives of the Shigella dysenteriae type 1 O-antigen
作者:Laurence A. Mulard、Cornelis P.J. Claudemans
DOI:10.1016/0008-6215(95)00122-a
日期:1995.9
The synthesis of methyl O-alpha-L-rhamnopyranosyl-(1-->2)-alpha-D-galactopyranosides specificallydeoxygenated at position 2 (31), or 4 (21) of the rhamnopyranosyl residue was accomplished using methyl 3,4,6-tri-O-benzoyl-alpha-D-galactopyranoside (18) as the glycosyl acceptor. Phenyl thionocarbonate activation of the penta-O-benzoylated disaccharide precursor followed by Barton reduction and Zemplén