Total Synthesis of the Alkaloids Martinelline and Martinellic Acid via a Hetero Diels−Alder Multicomponent Coupling Reaction
作者:David A. Powell、Robert A. Batey
DOI:10.1021/ol026293d
日期:2002.8.1
[reaction: see text] A concise synthesis of the guanidine alkaloids, (+/-)-martinelline and (+/-)-martinellic acid, using a protic acid catalyzed 2:1 hetero Diels-Alder coupling reaction between N-Cbz 2-pyrroline and methyl 4-aminobenzoate, is described. Protic acid catalysis, rather than Lewis acid catalysis, was necessary to achieve the desired sense of diastereocontrol in the coupling reaction.
[反应:参见正文]使用质子酸催化N-Cbz 2之间的2:1杂Diels-Alder偶联反应,精确合成了胍生物碱,(+/-)-马丁啉和(+/-)-马丁醇酸描述了吡咯啉和4-氨基苯甲酸甲酯。质子酸催化而不是路易斯酸催化对于在偶联反应中实现所需的非对映体控制意义是必需的。