Synthesis of α-methyl kainic acid by stereospecific lithiation–dearomatizing cyclization of a chiral benzamide
作者:Jonathan Clayden、Faye E Knowles、Christel J Menet
DOI:10.1016/s0040-4039(03)00570-7
日期:2003.4
Stereospecific lithiation of N-α-methylbenzyl benzamides gives configurationally stable tertiary benzyllithiums which undergo a stereospecific dearomatizing cyclization with >99% retention of stereochemistry. The products are partially saturated isoindolinones which carry a new fully-substituted stereogenic centre. A ten-step sequence converts one of these products to the α-methyl analogue of kainic
N -α-甲基苄基苯甲酰胺的立体特异性锂化产生了构型稳定的叔苄基锂,其经历了立体特异性脱芳香化环化反应,并保留了> 99%的立体化学。产品是部分饱和的异吲哚啉酮,带有一个新的完全取代的立体异构中心。十步序列将这些产物之一转化为海藻酸的α-甲基类似物。