Synthesis of Novel 3-Bromo-2H-chromene Derivatives: Palladium-Mediated Intramolecular Cyclization of Aryl Propargyl Ethers
作者:Paramasivan Perumal、Gurunathan Savitha、Kulandhai Felix
DOI:10.1055/s-0029-1217563
日期:2009.8
presence of catalytic amount of Pd(OAc) 2 in conjunction with stoichiometric amount of CuBr 2 and LiBr to the corresponding 3-bromo-2H-chromene derivatives in good yields. The protocol was further extended to synthesize 3-bromo-benzofused 2H-chromene derivatives.
The convenient room temperature metal-free one-pot cascade electrophilic addition/cyclization/oxidation reactions of (3-phenoxyprop-1-yn-1-yl)benzenes to divergent selective synthesize brominated benzopyran (3-bromo-2H-chromenes, 3-bromo-2H-chromen-2-ols and 3-bromo-2H-chromen-2-ones) by tuning the reagent amount of Br2 and H2O.
(3-苯氧基丙-1-yn-1-基)苯方便的室温无金属一锅级联亲电加成/环化/氧化反应发散选择性合成溴化苯并吡喃(3-bromo-2 H -chromenes, 3 -bromo-2 H -chromen-2-ols 和 3-bromo-2 H -chromen-2-ones),通过调整 Br 2和 H 2 O 的试剂量。
Bhuvaneswari N., Venkatachalam C. S., Balasubramanian K. K., J. Chem. Soc. Chem. Commun, (1994) N 10, S 1177
作者:Bhuvaneswari N., Venkatachalam C. S., Balasubramanian K. K.