(R)-8-cyclopropyl-6-(3-isopropylpiperazin-1-yl)-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridine-5-carbonitrile   、                                                                                      
三乙胺   、                                                                                      
丁二酸单甲酯酰氯                                                                                                                                                              在
                                                                                                                                                                                 Brine   、                                                                                                  
Sodium sulfate-III   、                                                                                                  crude product   、                                                                                                  
二氯甲烷,丙烷-2-酮                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以to afford 368 mg of (R)-methyl 4-(4-(5-cyano-8-cyclopropyl-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl)-2-isopropylpiperazin-1-yl)-4-oxobutanoate as light yellow oil的产率得到(R)-methyl 4-(4-(5-cyano-8-cyclopropyl-3,3-dimethyl-3,4-dihydro-1H-pyrano[3,4-c]pyridin-6-yl)-2-isopropylpiperazin-1-yl)-4-oxobutanoate