7-(3-bromobenzyl)-1,3-dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purine-8-carbaldehyde   、                                                                                      
正丁基氯化镁                                                                                                                                                              在
                                                                                                                                                                                 
氯化铵   、                                                                                                  
乙酸乙酯   、                                                                                                  crude product                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以to give 7-(3-bromobenzyl)-8-(1-hydroxypentyl)-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione (11.2 mg, 13.7%) as white solid的产率得到7-(3-bromobenzyl)-8-(1-hydroxypentyl)-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione