A practical method for multigram scale synthesis of (+)-methyl 5(S),6(R)-epoxy-6-formylhexanoate and 2(R),3(S)-epoxyoctanal, key intermediates for synthesis of leukotrienes A4
作者:Yuichi Kobayashi、Yasunori Kitano、Takashi Matsumoto、Fumie Sato
DOI:10.1016/s0040-4039(00)85062-5
日期:1986.1
A practical method for multigram scale synthesis of (+)-methyl 5(S),6(R)-epoxy-6-formylhexanoate () and 2(R),3(S)-epoxyoctanal (), key intermediates for synthesis of leukotrienes A4, starting with (R)-glycer-aldehyde acetonide () is described.
A new approach to the construction of biphenylenes by the cobalt-catalyzed cocyclization of o-diethynylbenzenes with alkynes. Application to an iterative approach to [3]phenylene, the first member of a novel class of benzocyclobutadienoid hydrocarbons
作者:Bruce C. Berris、George H. Hovakeemian、Yee Hing Lai、Helene Mestdagh、K. Peter C. Vollhardt
DOI:10.1021/ja00306a013
日期:1985.10
Synthese de [3] phenylene, et de ses derives trimethylsilyles par reaction de diethynyl-1,2 benzene avec le bis-trimethylsilylacetylene en presence de η 5 -cyclopentadienyl dicarbonyl-cobalt. Oxydation et reduction des composes synthetises. Structure cristalline des derives silyles
合成这些 [3] 亚苯基,等 de ses 衍生出三甲基甲硅烷基反应 de diethynyl-1,2 苯 avec le 双三甲基甲硅烷基乙炔 en 存在 de η 5 - 环戊二烯基二羰基钴。氧化和还原合成合成。结构 cristalline des 派生 silyles
A Convenient Method for the Preparation of Secondary Propargylic Ethers. The Reactions of Acetals with 1-Trimethylsilyl-1-alkynes Promoted by the Combined Use of Catalytic Amounts of Tin(IV) Chloride and Zinc Chloride
SnCl4 and ZnCl2, acetals undergo a coupling with 1-trimethylsilylalkynes to give secondary propargylic ethers in good yields. Similarly, propargylic ethers are directly produced from aldehydes by the treatment with alkoxytrimethylsilanes and 1-trimethylsilylalkynes under the same conditions. This catalyst system also efficiently promotes aldol reaction of silylenolethers with acetals or aldehydes, and
A Convenient Method for the Preparation of Secondary Propargylic Ethers. The Reaction of Acetals with 1-Trimethylsilylalkynes Promoted by the Combined Use of Catalytic Amounts of Tin(IV) Chloride and Zinc Chloride
In the coexistence of catalytic amounts of SnCl4 and ZnCl2, acetals undergo a coupling with 1-trimethylsilylalkynes in good yields to give secondary propargylic ethers, which are also directly produced from aldehydes by the reaction with alkoxytrimethylsilanes and 1-trimethylsilylalkynes under the same conditions.
Novel [1,5] Sigmatropic Rearrangements of Cyclohexadienones Generated from Fischer Carbene Complexes. A New Strategy for Installing the C-20 Angular Ethyl Group in Aspidospermidine Alkaloids
作者:John F. Quinn、Mary Ellen Bos、William D. Wulff
DOI:10.1021/ol990063q
日期:1999.7.1
here the first examples of a [1,5] sigmatropicrearrangement in a 4a-alkyl-4a-hydrocarbazol-4-one to yield a 3-alkylcarbazol-4-one with a re-aromatized indole nucleus. The reaction of 1-methyl-3-substituted-indole-2-carbene complexes 1 with terminal alkynes yields 3,4a-dialkyl-1-methoxy-9-methylcarbazol-4-ones 2. These 4a-substituted carbazolones thermallyrearrange to cleanly give the more highly aromatic