Synthetic method of bicyclic guanidine

The invention discloses a synthesis method of bicyclic guanidine, which comprises the following steps: a) preparing the following raw materials: 5-7 parts of azacyclobutane, 3-4 parts of 1,3-propane diamine and 10-12 parts of dicyandiamide; b) preparing instruments: a reaction kettle, a reflux condenser, a stirrer and a distillation kettle; The method comprises the following steps: 1) mixing 5-7 parts of azacyclobutane and 3-4 parts of 1,3-propane diamine in a reaction kettle, and synthesizing 1,5,7-triazabicyclo[4.4.0] decene by taking 5-7 parts of azacyclobutane, 3-4 parts of 1,3-propane diamine and 10-12 parts of dicyandiamide as raw materials, although the price of the raw materials is high, in addition to the finished product of 1,3,7-triazabicyclo[4.4.0] decene, 1,3,7-triazabicyclo[4.4.0] decene can also be produced as a by-product with high added value, and melamine can be produced as a by-product, so that the synthesis income is increased, and the overall profit is increased. 本发明公开了一种的双环胍的合成方法，包括以下步骤：