作者:P. Veeraraghavan Ramachandran、Baoqing Gong、Aleksandar V. Teodorović
DOI:10.1016/j.jfluchem.2007.04.015
日期:2007.7
study of the asymmetric reduction of representative aryl and alkyl α-fluoro- and α-chloromethyl ketones using (−)-diisopinocampheylchloroborane [(−)-DIP-Chloride™] and (−)-B-isopinocampheyl-9-borabicyclo[3.3.1]nonane [R-Alpine-Borane®] has been made. It was observed that DIP-Chloride™ is superior in terms of the rate and enantioselectivity for both classes of halo-ketones. While the reduction of monofluoroacetone
使用(-)-二异樟脑基氯硼烷[(-)-DIP-Chloride™]和(-)- B-异樟脑基-9-borabicyclo [ ]不对称还原代表性的芳基和烷基α-氟代和α-氯甲基酮的比较研究3.3.1]壬烷[ ř -Alpine -硼烷® ]已经取得进展。观察到,对于两种类型的卤代酮,DIP-Chloride™在速率和对映选择性方面均优越。用DIP-Chloride™还原一氟丙酮和三氟丙酮可分别提供61%ee和96%ee的产物醇,而二氟丙酮的还原仅可产生5%ee。对于一氯丙酮,未观察到孤卤原子的影响,所有这些都表明一氟丙酮对路易斯酸性氯硼烷的螯合作用。