D‐xylose and optically pure 1,1′‐bi‐2‐naphthol (BINOL), was used as ligands for the palladium‐catalyzed allylic alkylation and amination. The matched pair was formed from D‐xylose‐derivatives and (S)‐BINOL. The asymmetric induction depends strongly on the substituent at the C5 of the carbohydrate backbone; both bulky 5‐O‐pivaloyl and 5‐deoxy derivatives gave excellent results, whereas ligands with trityl
单齿
呋喃糖苷亚
磷酰胺库可轻松地由廉价的
D-木糖和光学纯的1,1'-bi-
2-萘酚(BINOL)合成,用作
钯催化的烯丙基烷基化和胺化反应的
配体。配对是由
D-木糖衍
生物和(S)-BINOL形成的。不对称诱导在很大程度上取决于
碳水化合物主链C5处的取代基。庞大的5- O-
新戊酰基和5-脱氧衍
生物均具有出色的结果,而在C5位具有三苯甲基保护的
配体则导致低ee与配置相反的值。用于添加的溶剂也非常重要,在
乙醚中观察到最高的对映选择性。对于空间需求量高的
烯丙基乙酸酯,烷基化和胺化反应均达到98-99%ee的最佳结果。