Hexamethylene tetramine hydrotribromide is found to be superior to pyridine hydrotribromide when compared with the rate of reaction and chemoselectivity for the regioselective cyclisation of a number of ortho-cyclohexenyl phenols 1(a-j) to 3-bromo-2,4-propano-chromans 2(a-j).
DOI:
10.1080/00397919608003693
作为产物:
描述:
1-Chloro-4-cyclohex-2-en-1-yloxybenzene 以
various solvent(s) 为溶剂,
反应 16.0h,
以74%的产率得到4-Chloro-2-cyclohex-2-en-1-ylphenol
参考文献:
名称:
Majumdar, Krishna C.; Kundu, Anup K., Canadian Journal of Chemistry, 1995, vol. 73, # 10, p. 1727 - 1732
A number of ortho-cyclohexenyl phenols 2(a-i) have been cyclised by treatment with one equivalent of m-chloroperoxybenzoic acid in refluxing benzene for 4 h to furnish linearly fused 1-hydroxy-1,2,3,4,4a,9a-hexahydrodibenzofurans 3 (a-i) (70-80%) and bicyclic 3-hydroxy-1,3-ethanochromans 4(a-f) (10-20%). Products 3(a-i) were oxidised with 2,3-dichloro-5,6-dicyano-1 ,4-benzoquinone (excess) in refluxing dry xylene for 6 h to give 2,3-dihydrodibenzofuran-1 (2H)-ones 6(a-i) (85-95%).
Majumdar, K C; Kundu, A K, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1993, vol. 32, # 6, p. 605 - 606
作者:Majumdar, K C、Kundu, A K
DOI:——
日期:——
<i>N</i>-IODOSUCCINIMIDE MEDIATED REGIOSELECTIVE HETEROCYCLIZATION OF <i>o</i>-CYCLOHEX-2′-ENYL PHENOLS
作者:K. C. Majumdar、P. K. Basu
DOI:10.1081/scc-120015388
日期:2002.1.1
A number of 3,4-benzo-9-iodo-2-oxabicyclo[3.3.1]nonanes (2a-f) are synthesized in excellent yields by regioselective heterocyclization of o-cyclohex-2'-enyl phenols (1a-f) with N-iodosuccinimide in acetonitrile at 0-5degreesC.
Stannic Chloride–Iodine: An Efficient Reagent for Regioselective Synthesis of Furan–Fused Heterocycles
作者:K. C. Majumdar、A. Biswas、P. P. Mukhopadhyay
DOI:10.1080/00397910701470982
日期:2007.8.1
SnCl4-I-2-mediated cyclization of ortho-cyclohexenyl phenol and ortho-cyclohexenyl enol derivatives of coumarin, uracil, dimedone, and pyrone at room temperature for 1 h give the linear cyclized products in 78-90% yield, which, on treatment with 10% Pd-C at 250 degrees C for 1-2 h, afford corresponding aromatized products in 80-84% yield.