Organolithium-Induced Alkylative Ring Opening of Aziridines: Synthesis of Unsaturated Amino Alcohols and Ethers
作者:David M. Hodgson、Bogdan Štefane、Timothy J. Miles、Jason Witherington
DOI:10.1021/jo0615201
日期:2006.10.1
Organolithium-induced alkylative ring opening of N-sulfonyl-protected aziridinyl ethers is described. The reactions were efficiently carried out with a variety of organolithiums, providing a promising new strategy to unsaturated aminoalcohols and ethers. Cis- and trans-1,4-dimethoxybut-2-ene-derived aziridines were prepared, and their propensity to undergo organolithium- induced alkylative desymmetrization
Palladium-Catalyzed, Enantioselective Desymmetrization of <i>N</i>-Acylaziridines with Indoles
作者:Kinney Van Hecke、Tyler R. Benton、Michael Casper、Dustin Mauldin、Brandon Drake、Jeremy B. Morgan
DOI:10.1021/acs.orglett.1c02914
日期:2021.10.15
opening reactions of meso-aziridines generate chiral amine derivatives where the control of stereochemistry is possible through enantioselective catalysis. We report the use of a diphosphine–palladium(II) catalyst for the highlyenantioselective desymmetrization of N-acylaziridines with indoles. The β-tryptamine products are isolated in moderate to high yield across a range of indole and aziridine substitution
内消旋-氮丙啶的开环反应产生手性胺衍生物,通过对映选择性催化可以控制立体化学。我们报道了使用二膦-钯 (II) 催化剂对N-酰基氮杂环丙烷与吲哚进行高度对映选择性去对称化。β-色胺产物在一系列吲哚和氮丙啶取代模式中以中等至高产率分离。β-色胺产品的合成效用通过转化为溴化吡咯并二氢吲哚衍生物来证明。
Organolithium-mediated conversion of β-functionalised aziridines into alkynyl amino alcohols and diamines
作者:Jianhui Huang、Peter O'Brien
DOI:10.1039/b510920e
日期:——
The direct conversion of dihydrofuran and dihydropyrrole N-triisopropylbenzenesulfonyl aziridines into alkynyl amino alcohols and diamines respectively can be achieved using 3 equiv. sec-butyllithiumâPMDETA in THF; use of n-butyllithium and (â)-sparteine in Et2O gave an alkynyl amino alcohol in 60% ee.
The output of amplified spontaneous emission lasers
作者:H. Huang、G.J. Tallents
DOI:10.1016/j.jqsrt.2006.02.064
日期:2006.12
The output of amplified spontaneous emission (ASE) lasers such as X-ray lasers operated without mirrors is calculated exactly for Gaussian and Lorentzian small signal gain profiles by a simple Taylor series expansion. The accuracy of the 'Linford' formula commonly used as an approximation for the output of ASE lasers is evaluated by comparison to our exact solutions. The Linford formula is accurate to better than 10% for intensities produced by a Gaussian gain profile, but requires multiplication by a correction factor of at gain length product greater than 5 for Lorentzian gain profiles. (c) 2006 Elsevier Ltd. All rights reserved.