Selective Magnesiation of Chloro-iodopurines: An Efficient Approach to New Purine Derivatives
作者:Tomáš Tobrman、Dalimil Dvořák
DOI:10.1021/ol053013w
日期:2006.3.1
selective I/Mg exchange reaction with iPrMgCl at -80 degrees C. The reaction course at 0 degrees C is different. Magnesiation of 1 proceeds with the migration of magnesium to the 8 position of the purine nuclei. In the case of 4, substitution of iodine with an alkyl group from the Grignard reagent accompanied with a Cl/Mg exchange reaction takes place, and 6-alkyl-2-magnesiated purines (9) are formed
[反应:请参见文本] 6-氯-2-碘-9-异丙基嘌呤(1)和2-氯-6-碘-9-苄基嘌呤(4)与iPrMgCl在-80度进行选择性I / Mg交换反应C.在0摄氏度下的反应过程是不同的。1的镁化随着镁向嘌呤核的8位迁移而进行。在4的情况下,伴随着Cl / Mg交换反应,由格氏试剂中的烷基进行碘的取代,生成6-烷基-2-镁化的嘌呤(9)。如此制备的格氏试剂通过与醛反应得到相应的醇。