Silver(I) Oxide Mediated Highly Selective Monotosylation of Symmetrical Diols. Application to the Synthesis of Polysubstituted Cyclic Ethers
作者:Abderrahim Bouzide、Gilles Sauvé
DOI:10.1021/ol020071y
日期:2002.7.1
symmetrical diols and oligo(ethylene glycol)s with a stoichiometric amount of p-toluenesulfonyl chloride in the presence of silver(I) oxide and a catalytic amount of potassium iodide led selectively to the monotosylate derivatives in high yields. Polysubstituted cyclic ethers were obtained readily upon treatment of the corresponding diols with an excess of silveroxide. The high selectivity was explained
Total Synthesis and Determination of Relative and Absolute Configuration of Multiplolide A
作者:C. V. Ramana、Tushar P. Khaladkar、Soumitra Chatterjee、Mukund K. Gurjar
DOI:10.1021/jo7027568
日期:2008.5.1
A flexible approach for total syntheses of possible multiplolide A diastereomers establishing the relative and absolute configuration is documented. The adopted strategy features ring-closing metathesis (RCM) as the key reaction and screening of a set of substrates for the feasibility of RCM in general and for the requisite E-configuration of ring olefin in particular. Selective protecting groups manipulation