Zeolite (H-ZSM 5)-catalysed reduction of conjugated nitroalkenes with sodium cyanoborohydride
作者:Anuradha Gupta、Azizul Haque、Yashwant D. Vankar
DOI:10.1039/cc9960001653
日期:——
Conjugated nitroalkenes are readily reduced to the corresponding nitroalkanes with sodium cyanoborohydride in the presence of the zeolite H-ZSM 5 in methanol.
在甲醇中,配合着H-ZSM 5沸石的存在下,共轭硝基烯烃很容易被氰基硼氢化钠还原为相应的硝基烷烃。
Reaction of 2-nitro and 3-nitro-2-cyclohexenone acetals: Preparation of useful intermediates
作者:Yashwant D. Vankar、Anita Bava、G. Kumaravel
DOI:10.1016/s0040-4020(01)96113-7
日期:1991.3
Preparation of 2-nitro-2-cyclohexenone acetal starting from 2-nitrocyclohexanone acetal has been reported for the first time. This compound as well as 3-nitro-2-cyclohexenone acetal , whose synthesis has been reported by us earlier, react with a variety of nucleophiles to form highly functionalised intermediates. One of them viz. is converted into a bicyclic α- methylenen-γ-lactone using radical chemistry
Tandem oxa-Michael addition–SN2′ substitution of 4-chlorobut-2-yn-1-ol with nitroalkenes: a total allylic 1,3-strain-controlled diastereoselective synthesis of 3-vinylidenetetrahydrofurans
作者:Jean-Pierre Dulcère、Estelle Dumez
DOI:10.1039/a701160a
日期:——
Bu
t
OK-promoted reaction of 4-chlorobut-2-yn-1-ol 1 with
nitroalkenes 2 affords 3-vinylidenetetrahydrofurans 3 in good yields with
total diastereoselectivity.
4-chlorobut-2-yn-1-ol 1 与硝基烯烃 2 发生 Bu t OK 促进反应,生成 3-vinylidenetetrahydrofurans 3,产率高且具有完全非对映选择性。
A New Preparation of Functionalized 3-Alkanoylpyrroles and 7-Oxoisoindoles
Reaction of the ethylene acetals of β-nitroenones 3 with isocyano-acetates followed by acidic hydrolysis allowed the synthesis of 3-alkanoylpyrrole-2-carboxylates 9a-f and 7-oxo-4,5,6,7-tetrahydro-2H-isoindole-1-carboxylates 9g-i in good yield. 3-Alkanoyl-4-nitropyrroles 11a,b were obtained using 3 and tosylmethyl isocyanide.