Practical enantiodivergent syntheses of both enantiomers of carbovir, 1592U89 and six-membered ring analogues
作者:Horacio F. Olivo、Jiaxin Yu
DOI:10.1039/a708261d
日期:——
The hydroxylactones 4a–b (both available in optically pure form from biocatalytic processes) have been used in the preparation of carbovir, 1592U89, and their six-membered ring analogues.
Cyclohexenyl nucleosides: Synthesis of cis-4-(9H-purin-9-yl)-2-cyclohexenylcarbinols
作者:Michael J. Konkel、Robert Vince
DOI:10.1016/0040-4020(95)00926-4
日期:1996.1
Syntheses of the title compounds were accomplished in 6–7 steps, starting from cyclohexadiene and chlorosulphonyl isocyanate. The key step of the strategy involves a palladium coupling of cyclohexenyl dicarbonate 8 with either 6-chloropurine or 2-amino-6-chloropurine.
A Stereoconvergent Tsuji–Trost Reaction in the Synthesis of Cyclohexenyl Nucleosides
作者:Anna Esposito、Concetta Giovanni、Maria De Fenza、Giovanni Talarico、Marco Chino、Giovanni Palumbo、Annalisa Guaragna、Daniele D'Alonzo
DOI:10.1002/chem.201905367
日期:2020.2.26
A highly regio- and stereoselective route to d- and l-cyclohexenyl nucleosides has been devised, using the Tsuji-Trost reaction as the key step. Contrarily to the widely accepted mechanism (involving a net retention of configuration), the reaction proceeded in a highly stereoconvergent manner, providing cis nucleosides regardless of the relative configuration of the starting materials. DFT calculations