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.
Electron spin resonance spectroscopic investigation of carbohydrate radicals. Part 3. Conformation in deoxypyranosan-2-, -3-, and -4-yl radicals
作者:Hans-Gert Korth、Reiner Sustmann、Kay Stefan Gröninger、Tom Witzel、Bernd Giese
DOI:10.1039/p29860001461
日期:——
E.s.r. spectra of C-2, -3, and -4 carbohydrate free radicals, generated regiospecifically by halogen abstraction from acylated deoxyhexopyranoses are recorded in benzene solution. Analysis of the hyperfine splittings reveals the retention of 4C1 chair conformation of the parent compounds in the radicals.
在苯溶液中记录了C-2,-3和-4碳水化合物自由基的Esr光谱,这些自由基是由卤素从酰化的脱氧己基吡喃糖中提取出来的区域特异性地产生的。对超细分裂的分析表明,自由基中母体化合物的4 C 1椅构象得以保留。
Gouedard,M. et al., Bulletin de la Societe Chimique de France, 1973, p. 577 - 580