Rearrangements of bridged diallenes. A facile synthesis of novel condensed heterocycles by tandem [3,3]-sigmatropic rearrangement and double intramolecular michael addition of diallenyl disulfides and diselenides. Isolation of stable diallenyl diselenides
作者:Samuel Braverman、Meir Freund
DOI:10.1016/s0040-4020(01)87773-5
日期:1990.1
undergo consecutive 3,3]-sigmatropic rearrangement and double Michael addition, to the observed products. This mechanism is supported by the isolation of bis-τ,τ- diisopropylallenyl and bis-τ-methyl-τ-isopropylallenyl diselenides, under the same reaction conditions, and the rearrangement of the latter to the expected selenoloseleophene 33. The synthesis of the novel mixed selenolothiophene 35 by treatment
噻吩并噻吩14和硒酚硒基苯撑16是通过甲醇锂分别对τ,τ-二甲基烯丙基硫氰酸盐和硒氰酸盐的作用合成的。提出了以双-τ,τ-二甲基烯丙基二硫化物(20)或二硒化物为关键中间体的多步机理。据信后者对所观察到的产物进行了连续的3,3]-σ重排和双迈克尔加成。在相同的反应条件下,通过分离双-τ ,τ-二异丙基丙烯烯基和双-τ-甲基-τ-异丙基丙烯烯基二硒化物,并将后者重排为预期的硒代芴基33。还描述了通过用甲醇锂处理硫氰酸烯丙酯13和硒氰酸酯15的混合物来合成新型混合亚硒基噻吩35。