2,3-二取代的苯并A高效超声促进的合成[ b ]呋喃通过在离子液体[BMIM] BF分子内的C-C键形成4在室温下†
摘要:
据报道,在室温下,在离子液体[bmim] BF 4中超声有效地促进了2,3-二取代的苯并[ b ]呋喃的合成。在大气条件下,使用无水K 3 PO 4作为温和且廉价的碱,可以介导5 -exo-dig Carbanion-yne分子内环化反应,从而以优异的收率得到标题为benzo [ b ]呋喃的化合物。离子液体[bmim] BF 4既用作反应介质,又用作形成CC键的催化剂。
A variety of substituted benzo[b]furans are readily prepared in good to excellent yields under the mild reaction conditions from o-(1-alkynylphenoxy)-1-phenylethanone under phase-transfer catalysis (PTC). This methodology accommodates simple experimental operations, inexpensive and environmentally benign catalysts, metal catalyst-free conditions, facile reagents and the possibility to conduct large-scale
在相转移催化(PTC)下,由邻-(1-炔基苯氧基)-1-苯基乙酮在温和的反应条件下,可以容易地以良好的产率或优异的产率制备各种取代的苯并[ b ]呋喃。该方法学适用于简单的实验操作,廉价且对环境无害的催化剂,无金属催化剂的条件,简便的试剂以及进行大规模制备的可能性。通过整体结构异构化发展碳-碳键形成过程代表了最经济的方法。
Phosphazene base-catalyzed intramolecular cyclization for efficient synthesis of benzofurans via carbon–carbon bond formation
作者:Chikashi Kanazawa、Kengo Goto、Masahiro Terada
DOI:10.1039/b913588j
日期:——
An organic superbase, phosphazene P4-(t)Bu, functioned as an active catalyst for intramolecularcyclization of o-alkynylphenyl ethers via carbon-carbon bond formation to provide an efficient synthetic method for 2,3-disubstituted benzofurans derivatives under mild reaction conditions without the need for a metal catalyst.
ZnBr<sub>2</sub>-Mediated Cascade Reaction of <i>o</i>-Alkoxy Alkynols: Synthesis of Indeno[1,2-<i>c</i>]chromenes
作者:Amol Milind Garkhedkar、Gopal Chandru Senadi、Jeh-Jeng Wang
DOI:10.1021/acs.orglett.6b03642
日期:2017.2.3
A Lewis acid-mediatedcascade annulation of o-alkoxy alkynols in the presence of ZnBr2 has been developed. The cascadecyclization proceeds through a 5-exo-dig cyclization followed by a Friedel–Crafts reaction and ring-opening sequence to synthesize indeno[1,2-c]chromenes. This protocol provides a broad substrate scope in moderate to good yields with high regioselectivity. The reaction with benzo-fused
已经开发了在ZnBr 2存在下路易斯酸介导的邻烷氧基炔醇的级联环化反应。级联环化是通过5- exo- dig环化进行的,然后进行Friedel-Crafts反应和开环序列以合成茚并[1,2- c ]色烯。该方案以中等至良好的产率和高的区域选择性提供了广泛的底物范围。与苯并稠合的环烷基酮的反应产生了意外的炔烃C–C键断裂,从而导致了稠合的多环。
Iron-catalyzed annulations of 2-(2-alkynyl)phenoxy)-1-arylethanones leading to substituted naphthalen-1-ols
作者:Zhi-Qiang Wang、Yun Liang、Yong Lei、Ming-Bo Zhou、Jin-Heng Li
DOI:10.1039/b911669a
日期:——
A novel intramolecular annulation of 1-(2-alkynylphenoxy)propan-2-ones catalyzed by iron, an economical and environmentally-benign transition metal, has been developed; this new atom-economical route includes dual C–H functionalizations to construct the naphthalen-1-ol or anthracen-1-ol skeletons.
Intermolecular Sonogashira Coupling and Intramolecular 5-<i>Exo</i>-<i>dig</i> Cycloisomerization Cascade: A One-Pot Pathway for Accessing (3-Benzylbenzofuran-2-yl)(phenyl)methanones
作者:Dakoju Ravi Kishore、Gedu Satyanarayana
DOI:10.1021/acs.joc.2c01101
日期:2022.8.5
straightforward strategy enabling access to 2,3-disubstitutedbenzo[b]furans. The whole synthetic process proceeds via a domino intermolecular Sonogashira coupling of 2-(2-bromophenoxy)-1-phenylethan-1-ones/alkyl 2-(2-bromophenoxy)acetates/2-(2-bromophenoxy)acetonitrile/1-(2-bromophenoxy)propan-2-one with terminal acetylenes followed by an intramolecular carbanion-yne cyclization in a 5-exo-dig manner and subsequent