nonylcarbonyloxymethyl chloroformate   、                                                                                                                                                                                                                                                    在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以26 %的产率得到decanoyloxymethyl 3-[2-[[6-(difluoromethylidene)-2,3,5,7-tetrahydro-1H-pyrrolizin-8-yl]methoxy]-7-(8-ethynyl-7-fluoro-3-hydroxynaphthalen-1-yl)-8-fluoropyrido[4,3-d]pyrimidin-4-yl]-3,8-diazabicyclo[3.2.1]octane-8-carboxylate