The intramolecular Buchner reaction of aryl diazoketones. Substituent effects and scope in synthesis
作者:Michael Kennedy、M. Anthony McKervey、Anita R. Maguire、Sarbajna M. Tuladhar、M. Fiona Twohig
DOI:10.1039/p19900001047
日期:——
cyclisation occurring in all cases. When the precursor contains a meta-methoxy substituent, 2-tetralones are obtained directly. The efficient conversion of 3-phenylpropionic acid into trans-1-methylbicyclo[5.3.0]decan-2-one is also described, partial asymmetric synthesis having been realised through the use of rhodium (S)-mandelate as the cyclisation catalyst. Cyclisations of diazoketones derived from
根据前驱体中芳基环的取代方式,由铑(II)乙酸催化的3-芳基丙酸衍生的α-二氮酮的环化反应会生成双环[5.3.0]癸二酮或2-四氢萘酮。前者的产物用三氟乙酸催化转化为后者。已经检测了具有甲基,甲氧基和乙酰氧基取代基的前体,在所有情况下均发生有效的环化。当前体含有间-甲氧基取代基时,直接获得2-四氢萘酮。还描述了将3-苯基丙酸有效转化为反-1-甲基双环[5.3.0]癸烷-2-酮,已通过使用铑实现了部分不对称合成(S-扁桃酸酯作为环化催化剂。还研究了由4-苯基丁酸和5-苯基戊酸衍生的重氮酮的环化。前者为双环[5.4.0]十一烷体系提供了新的入口,而后者通过CH的插入产生了2,3-二取代的环戊酮。讨论了稠环系统中环庚三烯-降二十碳烯平衡的各个方面。