Site-Selective Mono-Oxidation of 1,2-Bis(boronates)
作者:Lu Yan、James P. Morken
DOI:10.1021/acs.orglett.9b01204
日期:2019.5.17
Site-selective oxidation of vicinal bis(boronates) is accomplished through the use of trimethylamineN-oxide in 1-butanol solvent. The reaction occurs with good efficiency and selectivity across a range of substrates, providing 2-hydro-1-boronic esters which are shown to be versatile intermediates in the synthesis of chiral building blocks.
Broad-Spectrum Catalysts for the Ambient Temperature Anti-Markovnikov Hydration of Alkynes
作者:Le Li、Mingshuo Zeng、Seth B. Herzon
DOI:10.1002/anie.201404320
日期:2014.7.21
Anti‐Markovnikov alkynehydration provides a valuable route to aldehydes. Half‐sandwich ruthenium complexes ligated by 5,5′‐bis(trifluoromethyl)‐2,2′‐bipyridine are remarkably active for this transformation. In the presence of 2 mol % metal, a wide range of functionalized aliphatic and aromatic alkynes are hydrated in high yield at ambienttemperature.
Design, chemical synthesis, and in vitro biological evaluation of simplified estradiol–adenosine hybrids as inhibitors of 17β-hydroxysteroid dehydrogenase type 1
作者:Marie Bérubé、Donald Poirier
DOI:10.1139/v09-083
日期:2009.8
and the cofactor-binding sites of 17β-hydroxysteroiddehydrogenasetype 1 (17β-HSD1). These analogues of potent E2–adenosine hybrid inhibitor EM-1745, where the adenosine moiety was replaced by a more stable benzene derivative, were synthesized from estrone using alkene cross-metathesis and Sonogashira coupling reactions as key steps. In vitro biologicalevaluation of these steroid derivatives revealed
Total Synthesis of (+)-Aspicilin. The Naked Carbon Skeleton Strategy vs the Bioorganic Approach
作者:Subhash C. Sinha、Ehud Keinan
DOI:10.1021/jo9614811
日期:1997.1.1
The advantages of the "naked carbon skeleton" strategy in the totalsynthesis of polyoxygenated natural products are demonstrated in the totalsynthesis of the 18-membered macrolide (+)-aspicilin, 1. This approach employs the easily prepared, nonfunctionalized carbon skeleton of the target molecule, hexadeca-1,3,15-triene, 2. All the required stereogenic carbinol centers are then introduced onto this
Photochemistry of macrocyclic ketones within zeolites: competition between norrish type I and type II reactivity
作者:V. Ramamurthy、Xue-Gong Lei、Nicholas J. Turro、Thillairaj J. Lewis、John R. Scheffer
DOI:10.1016/0040-4039(91)80562-k
日期:1991.12
Y zeolites gives Norrishtype I products in addition to the products obtained via the NorrishtypeII process, the only observed process in isotropic media. Enhancement of the type I over the typeII process is cation-dependent and especially large enhancements are obtained with Li and Na as cations. The zeolite effect is attributed to a reduction in the rate of the NorrishtypeII α-hydrogen abstraction