(R)-4-(2-((tert-butoxycarbonyl)imino)-4,4-diethyl-6-oxotetrahydropyrimidin-1(2H)-yl)chroman-6-carboxylic acid 、
(S)-4-aminothiochromane 1,1-dioxide 在
N,N-二异丙基乙胺 、 (1,2,3-benzotriazol-1-yloxy)tris(dimethylamino)phosphanium hexafluoro-lambda5-phosphanuide 作用下,
以
二氯甲烷 为溶剂,
生成 tert-butyl ((E)-1-((R)-6-(((S)-1,1-dioxidothiochroman-4-yl)carbamoyl)chroman-4-yl)-4,4-diethyl-6-oxotetrahydropyrimidin-2(1H)-ylidene)carbamate