Functionalized Tetrahydrofurans from Alkenols and Olefins/Alkynes via Aerobic Oxidation−Radical Addition Cascades
作者:Patrick Fries、Daniel Halter、Alexander Kleinschek、Jens Hartung
DOI:10.1021/ja108403s
日期:2011.3.23
Aerobic oxidation of alkyl- and phenyl-substituted 4-pentenols (bishomoallyl alcohols), catalyzed by cobalt(II) complexes in solutions of γ-terpinene or cyclohexa-1,4-diene, stereoselectively gave tetrahydrofurylmethyl radicals. Cyclized radicals were trapped with monosubstituted olefins (e.g., acrylonitrile, methyl acrylate), (E)- and (Z)-1,2-diacceptor-substituted olefins (e.g., dimethyl fumarate
在γ-萜品烯或环六-1,4-二烯的溶液中,由钴(II)配合物催化的烷基和苯基取代的4-戊烯醇(双单烯丙基醇)的有氧氧化立体选择性地产生四氢呋喃甲基自由基。环化自由基被单取代烯烃(例如,丙烯腈、丙烯酸甲酯)、(E)-和(Z)-1,2-二受体取代的烯烃(例如,富马酸二甲酯、富马二腈、N-苯基马来酰亚胺)和酯捕获-取代的炔烃(例如丙炔酸乙酯)。因此,氧化加成级联在立体选择性反应(2,3-反式、2,4-顺式、和 2,5-反)。非对映异构纯的双四氢呋喃是在级联反应中制备的,该级联由两次有氧氧化、一次炔加成、