Palladium-Catalyzed Oxidative Synthesis of Highly Functionalized Ortholactones
作者:Kate L. Baddeley、Qun Cao、Mark J. Muldoon、Matthew J. Cook
DOI:10.1002/chem.201500862
日期:2015.5.18
A palladium‐catalyzed oxidative reaction is reported which converts dihydropyrans to their corresponding ortholactone. The products are formed in good to excellent yields with a very high level of chemoselectivity and functional group tolerance. Mechanistic studies confirm that the reaction proceeds by a Wacker‐type mechanism.
A highly selective Bi(OTf)3 mediated fragmentation-contraction of δ-ortholactones. A facile route to functionalized γ-lactones
作者:Kate L. Baddeley、Matthew J. Cook
DOI:10.1016/j.tet.2018.04.055
日期:2018.9
providing functionalized γ-lactones as a single isomericproduct following the ring contraction. Mechanistic studies indicate the reaction is mediated by triflic acid liberated from Bi(OTf)3 in a slow and controlled manner providing excellent chemo and regioselectivity. We propose the triflic acid acts as both a proton and a nucleophile source with triflate anion mediating the fragmentation process.
A novel, iterative, stereoselective route to the synthesis of axially linked 2-deoxysaccharides
作者:Hari Babu Mereyala、D Ravi
DOI:10.1016/0040-4039(91)80508-4
日期:1991.12
The title synthesis is described by 1,2-addition of 20mercaptpyridine (1) on simple (2 and 3) as well as on sensitive glycal saccharides (7 and 8) to obtain the respective 2-deoxy 2-pyridyl 1-thioglycopyranosyl donors (4, 5, 9, 10). Glycosylations by the proven methyl iodide activation procedure is described.