Ring-Opening Reactions of N-Aryl-1,2,3,4-tetrahydroisoquinolines: Synthesis of Novel Isoquino[2,1-a][3,1]benzoxazine Derivatives
摘要:
The aldehydes 7e and 7h were prepared by treatment of the 1,2,3,4-tetrahydroisoquinolines 5e and 5h,, respectively, with N-bromosuccinimide (NBS). Basic hydrolysis of compounds 7e and 7h gave the 4bH,6H-isoquino[2,1-a][3,1]benzoxazine derivatives 9 (R=H, OMe). Heterocycle 10 was obtained from the reaction of compound 5e with NBS and isolated as the ethyl derivative 11. (C) 2000 Elsevier Science Ltd. All rights reserved.
Ring-Opening Reactions of N-Aryl-1,2,3,4-tetrahydroisoquinolines: Synthesis of Novel Isoquino[2,1-a][3,1]benzoxazine Derivatives
摘要:
The aldehydes 7e and 7h were prepared by treatment of the 1,2,3,4-tetrahydroisoquinolines 5e and 5h,, respectively, with N-bromosuccinimide (NBS). Basic hydrolysis of compounds 7e and 7h gave the 4bH,6H-isoquino[2,1-a][3,1]benzoxazine derivatives 9 (R=H, OMe). Heterocycle 10 was obtained from the reaction of compound 5e with NBS and isolated as the ethyl derivative 11. (C) 2000 Elsevier Science Ltd. All rights reserved.
Efficient cyclization of tertiary amines and alkenes promoted by KOt-Bu–DMF
作者:Yan-yan Chen、Xue-jing Zhang、Hui-min Yuan、Wen-tao Wei、Ming Yan
DOI:10.1039/c3cc46340k
日期:——
Nitrogen heterocycles could be prepared in good yields via intramolecular cyclization of tertiary amines and alkenes promoted by KOt-BuâDMF.
氮杂环可以通过KOt-Bu–DMF促使的三级胺和烯烃的分子内环化反应高产量制备。
Ring-Opening Reactions of N-Aryl-1,2,3,4-tetrahydroisoquinolines: Synthesis of Novel Isoquino[2,1-a][3,1]benzoxazine Derivatives
作者:Stephen P Stanforth
DOI:10.1016/s0040-4020(99)01015-7
日期:2000.1
The aldehydes 7e and 7h were prepared by treatment of the 1,2,3,4-tetrahydroisoquinolines 5e and 5h,, respectively, with N-bromosuccinimide (NBS). Basic hydrolysis of compounds 7e and 7h gave the 4bH,6H-isoquino[2,1-a][3,1]benzoxazine derivatives 9 (R=H, OMe). Heterocycle 10 was obtained from the reaction of compound 5e with NBS and isolated as the ethyl derivative 11. (C) 2000 Elsevier Science Ltd. All rights reserved.