Unsaturated carbohydrates. Part 29 Their application to the synthesis of stereospecifically doubly and triply branched derivatives
作者:Robert J. Ferrier、Paul M. Petersen
DOI:10.1016/s0040-4020(01)97579-9
日期:1990.1
Treatment of 23-dideoxy-α---hex-2-enopyranosyl derivatives having 2-haloethyl substituents separately at O-1 and O-4 with tri--butyltin hydride together with a radical initiator gave products 16 and 56 with tetrahydrofuranyl rings -fused to C-1 C-2 and C-3 C-4 respectively. When these reactions which afforded compounds with stereospecific branch-points at C-2 and C-3 were carried out in the presence
23二脱氧α-治疗-具有-己-2-烯吡喃糖基衍生物2-卤乙基取代基分别在O-1和O-4与三-butyltin氢化物一起与自由基引发剂,得到产物16和56与环四氢呋喃基-分别与C-1 C-2和C-3 C-4融合。当这些反应在丙烯酸甲酯或烯丙基三丁基锡作为自由基载体的条件下进行时,得到的化合物在C-2和C-3处具有立体特异性支化点,则主要产物具有相同的双环结构,但具有额外的支化-在C-3和C-2点和所具有的α- - -和α- -分别-configurations。