2-Alkynylcyclopent-2-enols from 2-Alkynylcyclohex-2-enonesvia 1-Alkynyl-7-oxabicyclo[4.1.0]heptan-2-ones
作者:Birgit Sander、Sven Andresen、Stefan Reichow、Katia Dubois、William C. Agosta、Paul Margaretha
DOI:10.1002/hlca.19960790515
日期:1996.8.7
1-alkynyl-7-oxabicyclo[4.1.0]heptan-2-ones 3a–c and 4a–c, respectively. The 3-unsubstituted bicyclic epoxy ketones 3a, 3b, and 4a, 4b react further with H2O2/NaOH, undergoing ring contraction and (formal) decarbonylation to give 2-alkynylcy-clopent-2-enols 5a, 5b, and 6a, 6b, respectively. Epoxy ketones 3 are also obtained under neutral conditions on irradiation (λ = 350 nm) of cyclohexenones 1 in air-saturated
2-炔基环己-2-烯酮1a–c和2a–c与MeOH中的H 2 O 2 / NaOH反应,得到1-炔基-7-氧杂双环[4.1.0]庚-2-酮3a–c和4a–c, 分别。3-未取代的双环环氧酮3a,3b和4a,4b与H 2 O 2 / NaOH进一步反应,经历环收缩和(正式)脱羰基反应,生成2-炔基-环-2-戊烯基化合物5a,5b和6a ,6b分别。在环己酮1的辐射(λ= 350 nm)下,在中性条件下也可获得环氧酮3在空气饱和的苯溶液中。同样,在中性条件下氧代cycloalkenecarbonitriles 8反应(热)用H 2 ö 2在MeCN,得到oxabicyclic腈9。