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研究Lawesson试剂与含有两个氨基的底物的成环反应，合成了N-P-N型五元、六元磷杂环3a-3b、sa－5b及8a－8b，并讨论了成环机理．初步的生测结果表明，所合成的磷杂环具有一定的除草活性，因此LR的成环反应是合成具有生物活性的磷杂环的新方法．
The ring-forming reaction between Lawesson’s reagent and two amino-containing substrates was studied. N-P-N five-membered, six-membered phosphorus heterocycles 3a-3b, sa-5b and 8a-8b were synthesized and the ring formation mechanism was discussed. Preliminary bioassay results show that the synthesized phosphatidyl ring has certain herbicidal activity. Therefore, the ring formation reaction of LR is a new method to synthesize the bioactive phosphatidyl ring.