作者:Timothy B. Durham、Nicolas Blanchard、Brad M. Savall、Noel A. Powell、William R. Roush
DOI:10.1021/ja048493l
日期:2004.8.1
enantioselective total synthesis of the cytotoxic plecomacrolide natural product formamicin (1) is described. Key aspects of this synthesis include the efficient transacetalation reactions of MOM ethers 28 and 38 to form the seven-membered formyl acetals 29 and 39, a late-stage Suzuki cross-coupling reaction of the highly functionalized vinyl boronic acid 6 and vinyliodide 7, a highly beta-selective
An efficient synthesis of C-11 substituted 6H-pyrido[4,3-b]carbazoles
作者:Sandeep P. Modi、Meged A. Michael、Sydney Archer、James J. Carey
DOI:10.1016/s0040-4020(01)82308-5
日期:1991.8
treated with one equivalent of MeLi followed by quenching of the reaction mixture with water to give the lactone 19 Compound 19 was treated with a number of organolithium reagents such as methyllithium. n-butyllithium, ethoxyvinyl lithium and the lithio derivative of formaldehyde diethyl mercaptal to give, after sodium borohydride reduction, 1, 15, 30, and 31 respectively. Compounds 30 and 31 were hydrolyzed
(<i>E</i>)-2-Boryl-1,3-butadiene Derivatives of the 10-TMS-9-BBDs: Highly Selective Reagents for the Asymmetric Synthesis of <i>anti-</i>1,2-Disubstituted 3,4-Pentadien-1-ols
作者:Javier R. González、Ana Z. González、John A. Soderquist
DOI:10.1021/ja9047202
日期:2009.7.29
The efficient stepwise construction of optically pure trans-4-substituted 2-boryl-1,3-butadienes 6 is described. Hydroboration of 1-alkynes with either enantiomeric form of 3 leads to the pure trans-1-alkenylboranes 4 which undergo addition of alpha-ethoxyvinyllithium followed by a BF(3)-mediated 1,2-B-->C vinylic group migration to provide 6. These organoboranes 6 serve as a new type of asymmetric
Regiodivergent Stereoselective Access to Fused Alkylideneazetidines
作者:Arif Music、Andreas N. Baumann、Michael Eisold、Dorian Didier
DOI:10.1021/acs.joc.7b02786
日期:2018.1.19
simplification of 2H-azetine synthesis, a regiodivergent approach to fused 2- and 3-alkylideneazetines was designed via the intermediate formation of unprecedented vinylazetine structures. Concise sequences to the latter are described from which an expected unsaturated fused ring system was isolated with very high yields and regio- and stereoselectivities by [4 + 2] cycloadditions.
申请人:Research Foundation of State University of New York
公开号:US06340768B1
公开(公告)日:2002-01-22
Volatile metal complexes with &agr;-sila-&bgr;-diketonate ligands containing haloalkyl, and particularly, perfluoroalkyl, substitutents are useful as metal precursors for chemical vapor deposition processes and as nanostructured materials containing fluorous domains.