Palladium catalysed reaction of allene with phenols. Phenoxymethyl-1,3-dienes and their further reactions
作者:Ronald Grigg、Ngampong Kongkathip、Boonsong Kongkathip、Suwaporn Luangkamin、H.Ali Dondas
DOI:10.1016/s0040-4020(01)00771-2
日期:2001.9
A 3-step 100% atom economic sequence is reported whereby a variety of phenols react with 2 mol equiv. of allene to give phenoxymethyl-1,3-dienyl ethers. Subsequent thermal Claisen rearrangement to C-1,3-dienes and acid catalysed ring closure furnishes 3:1–6.5:1 mixtures of exo-methylene chromans and dihydrobenzofurans with the former predominating.
据报道,有3个步骤的100%原子经济顺序,其中各种酚与2摩尔当量反应。烯基得到苯氧基甲基-1,3-二烯基醚。随后的C-1,3-二烯热克莱森重排和酸催化的闭环反应提供了3:1–6.5:1外-亚甲基苯并二氢苯并呋喃和二氢苯并呋喃的混合物,其中前者占主导地位。