(R)-[5-cyano-7-hydroxy-8-methyl-1-propyl-1,3,4,9-tetrahydro-pyrano.[3,4-b]indol-1-yl]-acetic acid methyl ester 、
(3-氯甲基-[1,2,4]噻二唑-5-基)-二甲基-胺 在
potassium iodide
potassium carbonate 作用下,
以
N-甲基吡咯烷酮 为溶剂,
以74%的产率得到(R)-[5-Cyano-7-(5-dimethylamino-[1,2,4]thiadiazol-3-ylmethoxy)-8-methyl-1-propyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indol-1-yl]-acetic acid methyl ester