The invention belongs to the technical field of medicines, and particularly relates to a synthesis method of
caspofungin. The synthesis method comprise the following steps: mixing a compound shown asformula II and
thionyl chloride dissolved in a
solvent A to form a compound shown as formula III, mixing the compound shown as the formula III without purification and ethidene
diamine dissolved in asolvent B to form a compound shown as formula IV, mixing the compound shown as the formula IV and a
borane complex to form a compound shown as formula I. The synthesis method replaces virulent and malodorous
thiol or
thiophenol compound with an irritating
odor with
thionyl chloride, and avoids using highly
corrosive acid; formed cyclic sulphite facilitates configuration retention of a reactant; atthe same time, an ethidene
diamine group is directly introduced into cyclic sulphite without the purification since cyclic sulphite has properties that cyclic sulphite is easy to remove and does notchange a chiral configuration of the reactant; a reaction procedure is shortened; the number of times of the purification for preparation is reduced; and the purity and yield are improved.