title: Convergent synthesis of a tetrasaccharide repeating unit of the O-specific polysaccharide from the cell wall lipopolysaccharide of Azospirillum brasilense strain Sp7.
abstract: A straightforward convergent synthesis has been carried out for the tetrasaccharide repeating unit of the O-specific cell wall lipopolysaccharide of the strain Sp7 of Azospirillum brasilense. The target tetrasaccharide has been synthesized from suitably protected monosaccharide intermediates in 42% overall yield in seven steps by using a [2 + 2] block glycosylation approach.
authors.affiliation: Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram extension, Sitapur Road, Lucknow, 226 031, India.
authors.forename: Pintu Kumar
authors.initials: PK
authors.lastname: Mandal
authors.affiliation: Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India.
authors.forename: Debashis
authors.initials: D
authors.lastname: Dhara
authors.affiliation: Bose Institute, Division of Molecular Medicine, P-1/12, C.I.T. Scheme VII-M, Kolkata-700054, India.
authors.forename: Anup Kumar
authors.initials: AK
authors.lastname: Misra
keywords: Azospirillum brasilense; glycosylation; lipopolysaccharide; plant growth-promoting bacteria (PGPB); tetrasaccharide