β-Fragmentation of Primary Alkoxyl Radicals versus Hydrogen Abstraction: Synthesis of Polyols and α,ω-Differently Substituted Cyclic Ethers from Carbohydrates
The beta-fragmentation of primary alkoxyl radicals, described in many cases as low-yielding and plagued by side reactions, can proceed in satisfactory yields using carbohydrate substrates. The only reaction that can compete significantly with the beta-scission is the intramolecular hydrogenabstraction. The ratio of beta-fragmentation to hydrogenabstraction can be varied according to the reaction conditions
Synthesis of orotidine by intramolecular nucleosidation
作者:E.-K. Kim、R. Krishnamurthy
DOI:10.1039/c5cc00111k
日期:——
An intramolecular nucleosidation approach provides easy access to orotidine in high yields. Notably, orotate itself is used as a leaving group at the anomeric position. This method has the potential for facileaccess to derivatives of orotidine of therapeutic interest, with implications for prebiotic formation of nucleosides.