Substituent effects on the reaction mode between 2-hydroxybenzyl alcohol derivatives and MEM chloride: synthesis and mechanistic aspects of seven- and ten-membered benzo-fused O,O-acetals
作者:Estrella Saniger、Mónica Díaz-Gavilán、Beatriz Delgado、Duane Choquesillo、Josefa M. González-Pérez、Stefania Aiello、Miguel Á. Gallo、Antonio Espinosa、Joaquín M. Campos
DOI:10.1016/j.tet.2004.09.077
日期:2004.12
of (RS)-2- or (RS)-3-methoxy-2,3-dihydro-5H-1,4-benzodioxepins and (RS)-5- or (RS)-3-methoxy-2,3,5,6-tetrahydro-8H-benzo-[1,4,7]-trioxecins has been developed. The mechanism of such a reaction via the boron trifluoride etherate-promoted transformation of 2-(methoxyethoxymethoxy)benzyloxyacetaldehyde dimethyl acetals or 2-(methoxyethoxymethoxymethyl)phenyloxyacetaldehyde dimethyl acetals has been proposed
(RS)-2-或(RS)-3-甲氧基-2,3-二氢-5 H -1,4-苯并二恶英和(RS)-5-或(RS)-3-甲氧基-2的合成,已经开发了3,5,6-四氢-8 H-苯并-[1,4,7]-三恶英。已经提出了通过三氟化硼醚化物促进的2-(甲氧基乙氧基甲氧基)苄氧基乙醛二甲基乙缩醛或2-(甲氧基乙氧基甲氧基甲基)苯氧基乙醛二甲基乙缩醛的转化的反应机理。该反应的跨环形式导致12元中间体容易缩合为10元和7元苯稠合的O,O-缩醛。副产物的表征强烈支持提出的机制。