作者:P.D. Baruah、S. Mukherjee、M.P. Mahajan
DOI:10.1016/s0040-4020(01)89763-5
日期:1990.1
good yields (78–90%) of (2R,3S,4R)-6-aryl-2-aryl/furyl-3,4-dihydro-4-dimethylamino-3-nitro-2H-thiopyrans () as exclusive stereoisomers. The reactions of 3-N-arylamino-1-phenylpropene-1-thiones () with leading to stereospecific formation of (2R,3S,4S)-2-aryl-4-arylamino-3-nitro-6-phenyl-3,4-dihydro-2H-thiopyrans () and their conversions to thermodynamically more stable (2R,3S,4R)-2-aryl-4-arylamino-3-nitro-6-phenyl-3
烯胺硫酮()与硝基烯烃()的Diels-Alder环加成反应可得到(2R,3S,4R)-6-芳基-2-芳基/呋喃基-3,4-二氢-4的非常高的产率(78-90%) -二甲基氨基-3-硝基-2H-硫代吡喃()为唯一的立体异构体。3-N-芳基氨基-1-苯基丙烯-1-硫酮()的反应导致立体定向形成(2R,3S,4S)-2-芳基-4-芳基氨基-3-硝基-6-苯基-3, 4-二氢-2H-硫代吡喃()及其转化为热力学上更稳定的(2R,3S,4R)-2-芳基-4-芳基氨基-3-硝基-6-苯基-3,4-二氢-2H-硫代吡喃()也已报告。