ethyl 4-[[[[2-[[(2-methyl-5-oxazolyl)methyl]amino]-3-pyridinyl]amino]thioxomethyl]amino]-1-piperidinecarboxylate   、                                                                                      
N,N-二甲基甲酰胺                                                                                                                                                              在
                                                                                                                                                                                 
硫化氢                                                                                                                                  作用下,
                                                                                                                                                                                                                            以5.5 parts (38.2%)的产率得到ethyl 4-[[3-[(2-methyl-5-oxazolyl)methyl]-3H-imidazo[4,5-b]pyridin-2-yl]amino]-1-piperidine-carboxylate