Preparation of O-1∼C-6 and O-7∼C-14 fragments of colletodiol
作者:Hironori Tsutsui、Oyo Mitsunobu
DOI:10.1016/s0040-4039(01)81187-4
日期:1984.1
Formal total synthesis of grahamimycin A1
作者:Kazuo Ohta、Oyo Mitsunobu
DOI:10.1016/s0040-4039(00)79484-6
日期:1991.1
(S)-t-Butyldimethylsiloxy-2-hexenoic acid and its (R)-isomer were prepared from (S)- and (R)-3-hydroxybutanoic acid esters, respectively. Condensation of the both isomers with 2-(ptoluenesulfonyl)ethyl (4S,5S,7R)-7-hydroxy-4,5-dimethylmethylenedioxyoctanoate, synthesized from methyl 4,6-dideoxy -alpha-D-xylo-hexopyranoside, gave the corresponding esters which were converted into precursors of seco acids of grahamimycin A1 with S or R configuration at the C-6 position (grahamimycin A1 numbering). The (6S)- and (6R)-isomers were respectively subjected to macrolactonization by the use of diethyl azodicarboxylate-triphenylphosphine system or Yamaguchi procedure to afford 11, 12-dihydroxy-grahamimycin A1 whose oxidation to grahamimycin A1 has already been reported.
Syntheses of deoxyhexoses from diastereoisomerically pure hetero-Diels-Alder adduct
作者:Tomasz Bauer
DOI:10.1016/s0040-4020(97)00159-2
日期:1997.3
Syntheses of deoxyhexoses are presented. The concept is based on the functionalization of enantiomerically pure 6-hydroxymethyl-2-methoxy-5,6-dihydro-2H-pyran, which is easily synthesized by asymmetric hetero-Diels-Alder reaction. Methyl 4,6-dideoxy-alpha-D-arabino-hexopyranoside, methyl alpha-D-chalcoside and methyl alpha-D-desosanimide are synthesized. (C) 1997 Elsevier Science Ltd.
Synthesis of 4,6-dideoxy-D-arabino-hexose, 3,4,6-trideoxy-D-erythro- and threo-hexoses, 2,4,6-trideoxy-D-erythro-hexose and their derivatives