A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-α-D-ribo-pyranoside, the thio sugar of esperamicin A1
摘要:
A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-alpha-D-ribo-pyranoside (1b), the thio sugar isolated from esperamicin, is described. The synthesis involves the neighboring group assisted delivery of a sulfur nucleophile to C(5) of epoxyalcohol 6 via aniline promoted cyclization of thioimidazolide 7.
A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-α-D-ribo-pyranoside, the thio sugar of esperamicin A1
摘要:
A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-alpha-D-ribo-pyranoside (1b), the thio sugar isolated from esperamicin, is described. The synthesis involves the neighboring group assisted delivery of a sulfur nucleophile to C(5) of epoxyalcohol 6 via aniline promoted cyclization of thioimidazolide 7.
generate the desired 20‐membered macrolactam. This second‐generation strategy made it possible to prepare synthetic analogues of vicenistatin, including the C20‐ and/or C23‐demethyl analogues. Evaluation of the cytotoxic effect of these analogues indicated the importance of the fixed conformation of aglycon for determining the biological activity of the vicenistatins.
A highly convergent total synthesis of macrocyclic lactam glycoside vicenistatin is described. Key features of the synthesis include rapid assembly of the macrolactam part and macrocyclic ring closure via intramolecular Stille coupling.
Asymmetric synthesis of the hydroxylamino sugar of calicheamicin
作者:William R. Roush、Bruce C. Follows
DOI:10.1016/s0040-4039(00)73286-2
日期:1994.7
for the conversion of 2,3-epoxyalcohols to N-alkoxy oxazolidinones via the DBU promoted cyclizations of 2,3-epoxy-N-alkoxyurethanes has been developed and applied to the first asymmetric synthesis of the calicheamicin hydroxylamino sugar, 7.
A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-α-D-ribo-pyranoside, the thio sugar of esperamicin A1
作者:William R. Roush、Darin Gustin
DOI:10.1016/s0040-4039(00)73285-0
日期:1994.7
A stereochemically general synthesis of methyl 2,4,6-trideoxy-4-methylthio-alpha-D-ribo-pyranoside (1b), the thio sugar isolated from esperamicin, is described. The synthesis involves the neighboring group assisted delivery of a sulfur nucleophile to C(5) of epoxyalcohol 6 via aniline promoted cyclization of thioimidazolide 7.