Enantioselective Alkenylation via Nickel-Catalyzed Cross-Coupling with Organozirconium Reagents
作者:Sha Lou、Gregory C. Fu
DOI:10.1021/ja1017046
日期:2010.4.14
A new family of organometallic compounds, organozirconiumreagents, are shown to serve as suitable partners in cross-coupling reactions of (activated) secondary alkyl electrophiles. Thus, the first catalytic method for coupling secondary alpha-bromoketones with alkenylmetal reagents has been developed, specifically, a mild, versatile, and stereoconvergent carbon-carbon bond-forming process that generates
Studies in marine macrolide synthesis: Stereocontrolled synthesis of the C1C11 and C15C27 subunits of aplyronine A
作者:Ian Paterson、Cameron J Cowden、Michael D Woodrow
DOI:10.1016/s0040-4039(98)01191-5
日期:1998.8
containing 4 stereocentres and the (E,E)-diene system, was prepared in 7 steps from ethylketone (R)-8 using a boron-mediated anti aldolreaction. The corresponding C15C27 subunit 5, containing 6 stereogenic centres and an (E)-alkene, was obtained in 10 steps from ketone (S)-14 using a tin(II)-mediated syn aldolreaction and CBS enone reduction.
所述aplyronineÇ 1 C 11亚基4,含有4个立体中心和(ë,ë) -二烯系统,在从乙基酮(R)-8 7个步骤制备使用硼介导的抗醛醇缩合反应。使用锡(II)介导的合成羟醛缩合反应和CBS烯酮还原反应,从酮(S)-14分10个步骤获得了相应的C 15 = C 27亚基5,该基团包含6个立体生成中心和一个(E)烯烃。
Cytotoxicity and actin-depolymerizing activity of aplyronine A, a potent antitumor macrolide of marine origin, and its analogs
Artificial analogs of aplyronine A (1), a potentantitumor macrolide, were synthesized and structure–activity (cytotoxicity and actin-depolymerizing activity) relationships were investigated; the side-chain in 1 was found to play a key role in both biological activities.
作者:John T. Feutrill、Michael J. Lilly、Mark A. Rizzacasa
DOI:10.1021/ol017092x
日期:2002.2.1
[structure: see text] The first asymmetric synthesis of (+)-crocacin D (4) is described. The key steps in the sequence are the stereoselective assembly of the stereotetrad via a substrate-controlled aldol reaction and anti-selective reduction, formation of the (E,E)-diene by a Stille cross-coupling between the stannane 8 and vinyl iodide 9, and the acylation of (Z)-enecarbamate 6 with the acid chloride
Diastereoselective Aldol Additions of Chiral β-Hydroxy Ethyl Ketone Enolates Catalyzed by Lewis Bases
作者:Scott E. Denmark、Shinji Fujimori
DOI:10.1021/ol026593v
日期:2002.10.1
trichlorosilyl enolates derived from chiral ethyl ketones bearing a beta-hydroxyl group and an alpha-stereogenic center were employed in the phosphoramide-catalyzed aldol reaction. The addition of Z-enolates to achiral aldehydes produced aldol products in good yields and high syn relative diastereoselectivities. The internal diastereoselectivity is controlled by the catalyst configuration, allowing for