Reactions of Conjugated Nitro Olefins with Phosphoranes and with Dimethylsulfoxonium Methylide to Give Ylides and Nitrocyclopropanes, Respectively
作者:J Asunskis、H Schechter
DOI:10.1021/jo01267a600
日期:1968.3
Phosphine-Catalyzed Intramolecular Cyclizations of α-Nitroethylallenoates Forming (<i>Z</i>)-Furanone Oximes
作者:Qing-Fa Zhou、Kui Zhang、Lingchao Cai、Ohyun Kwon
DOI:10.1021/acs.orglett.6b01299
日期:2016.6.17
A novel and efficient phosphine-catalyzed intramolecular cyclization of α-nitroethylallenic esters is reported. This process appears to be practical for the stereoselectivesyntheses of (Z)-furan-2(3H)-one oxime derivatives in excellent yields. Mechanistically, the reaction involves a phosphine-catalyzed Michael addition of an alkylideneazinate and rearrangement of the cyclic nitronate to the α-nitrosodihydrofuran
报道了一种新型且有效的膦催化的 α-硝基乙基联烯酸酯的分子内环化。该方法似乎适用于立体选择性合成 ( Z )-呋喃-2(3 H )-酮肟衍生物,收率优异。从机理上讲,该反应涉及亚烷基嗪酸盐的膦催化迈克尔加成反应以及环状硝基化合物重排为α-亚硝基二氢呋喃。