Diastereoselective synthesis of benzo[d]chromeno[3′,4′:3,4]pyrrolo[2,1-b]thiazoles via cycloaddition reaction of benzothiazolium salts with 3-nitrochromenes
作者:Wang Jiang、Jing Sun、Chao-Guo Yan
DOI:10.1039/c7ra06548e
日期:——
were also easily obtained by sequential oxidation with DDQ. The stereochemistry of the polycyclic compounds was clearly elucidated by analysis of NMR spectroscopy results and determination of single crystal X-ray structures. The reaction is believed to proceed via endo-[3 + 2] cycloaddition of the in situ generated anti-form ylides to the cyclic dipolarophiles.
室温下,在乙醇中,由三乙胺介导的溴化2-苯甲酰基-或2-烷氧基羰基甲基苯并噻唑鎓与3-硝基苯并茂的1,3-偶极环加成反应得到官能化的四氢苯并[ d ]色酚[3',4':3,4]吡咯并[2] ,1- b ]噻唑的产率为83–95%,非对映选择性高。相应的脱氢苯并[ d ]铬基[3',4':3,4]吡咯并[2,1- b ]噻唑也可以通过用DDQ顺序氧化而容易地获得。通过分析NMR光谱结果和确定单晶X射线结构,可以清楚地阐明多环化合物的立体化学。据信该反应是通过内-[3 + 2]环加成而进行的。原位产生的环状双极性亲抗剂。
CIOCOIU I.; ZUGRAVESCU I., BUL. INST. POLITEHN. IASI, 1979, SEC. 2, 25, HO 3-4, 81-85
作者:CIOCOIU I.、 ZUGRAVESCU I.
DOI:——
日期:——
SUTORIS, V.;HALGAS, J.;SEKERKA, V.;FOLTINOVA, P.;GAPLOVSKY, A., CHEM. ZVESTI, 1983, 37, N 5, 653-662
作者:SUTORIS, V.、HALGAS, J.、SEKERKA, V.、FOLTINOVA, P.、GAPLOVSKY, A.
DOI:——
日期:——
GIOCOIU, I.;ZUGRAVESCU, I., BUL. INST. POLITEHN. IASI, 1981, 27, N 3-4, 75-80