Alkynylation of Pentose Derivatives with Stereochemical Fidelity: Implications for the Regioselectivity of Alkynyl Diol Cycloisomerizations to Cyclic Enol Ethers
作者:Frank E. McDonald、Dian Ding、Andrew J. Ephron、John Bacsa
DOI:10.1021/acs.orglett.9b01024
日期:2019.5.3
This work characterizes a previously undetected epimerization in the preparation of alkynyl diols from pentose precursors utilizing the Ohira–Bestmann reagent. Lithium trimethylsilyldiazomethane (Colvin reagent) additions to the d-ribose and d-lyxose-derived benzylidene acetals provide the respective alkynyl diol stereoisomers, without epimerization. Regioselective tungsten-catalyzed cycloisomerizations
Synthesis of Differently Protected 1‐<i>C</i>‐Methyl‐Ribofuranoses Intermediates for the Preparation of Biologically Active 1′‐<i>C</i>‐Methyl‐Ribonucleosides
Starting from D-ribose, differently protected 1-C-methyl-D-ribofuranoses have been prepared as intermediates for the synthesis of variously modified 1'-C-methyl-ribonucleosides, a class of compounds potentially endowed with interesting biological activity.
MARYANOFF, BRUCE E.;REITZ, ALLEN B.;NORTEY, SAMUEL O., TETRAHEDRON, 44,(1988) N 11, C. 3093-3106
作者:MARYANOFF, BRUCE E.、REITZ, ALLEN B.、NORTEY, SAMUEL O.