Light-Induced Synthesis of Tricyclic Thiolane Derivatives from 2(5H)-thiophenonesvia consecutive radical ring closure
作者:Ren� Kiesewetter、Alan Graff、Paul Margaretha
DOI:10.1002/hlca.19880710225
日期:1988.3.16
Two α,β-unsaturated thiolactones, 5-(2-propynyl)-2(5H)-thiophenone (5) and 3,5-di(2-propenyl)−2(5H)-thiophenone (6), were newly synthesized. Irradiation (λ = 300 nm) of 5 in MeOH containing cyclopentene afforded a 3:1 mixture of diasteroisomeric methyl 7-thiatricyclo[6.4.0.02,6]dodec-10-ene-12-carboxylates (8a/8b), while irradiation of 6 in MeOH saturated with 2-methylpropene gives a 3:2 mixture of
两个α,β-不饱和硫代内酯5-(2-丙炔基)-2(5 H)-噻吩(5)和3,5-二(2-丙烯基)-2(5 H)-噻吩(6)是新合成的。照射(λ= 300纳米)的5在含有环戊烯MeOH中,得到一个3:非对映异构甲基-7- thiatricyclo [6.4.0.0的1:1混合物2,6 ]十二碳-10-烯-12-羧酸(8A / 8B) ,而照射用溶于2-甲基丙烯的MeOH中的6的三分之二得到3,2的非对映异构体甲基3,3,9-三甲基-5-硫代三环[6.2.1.0 2,6 ]十一烷-1-羧酸酯(10a / 10b)。