Novel Base-Promoted Rearrangement of 2-(4-Cyano-, 2-Nitro-, and 4-Nitrobenzyloxy)tropones and 2-(2-Oxo-2-phenethyloxy)tropone to 2-[(4-Cyano-, 2-Nitro-, and 4-Nitrophenyl)hydroxymethyl]tropones and 2-(1-Hydroxy-2-oxo-2-phenethyl)tropone
作者:Hitoshi Takeshita、Akira Mori、Hiroshi Suizu
DOI:10.1246/bcsj.60.1429
日期:1987.4
The base-catalyzed rearrangement of 2-(2-nitro-, 4-nitro-, and 4-cyanobenzyloxy)tropones smoothly yielded corresponding 2-[(aryl)hydroxymethyl]tropones, while their thermolysis gave 3-(arylmethyl)tropolones. This reaction has no precedent analogy in troponoid chemistry, and this rearrangement is widely applicable to the 2-troponyl ethers of alcohols carrying an electron-attractive substituent on the α-position, as was verified by the occurrence of 2-(1-hydroxy-2-oxo-2-phenethyl)tropone from 2-(2-oxo-2-phenethyloxy)tropone.
碱催化的2-(2-硝基、4-硝基和4-氰基苯氧基)特罗庞的重排顺利产生了相应的2-[(芳基)羟甲基]特罗庞,而它们的热分解则得到3-(芳基甲基)特罗波酮。这一反应在特罗庞化学中没有先例,且这种重排广泛适用于带有电子吸引取代基的α位的2-特罗庞醚,正如从2-(2-氧代-2-苯乙氧基)特罗庞得到2-(1-羟基-2-氧代-2-苯乙基)特罗庞所验证的那样。