Asymmetric synthesis of fagomine and its congeners
摘要:
The total synthesis of fagomine and its congeners 1-3 has been achieved starting from D-serine-derived Garner aldehyde 5 by catalytic ring-closing metathesis (RCM) for the construction of the piperidine ring followed by dihydroxylation. (C) 2001 Elsevier Science Ltd. All rights reserved.
Quaternary Ammonium Trifluoromethoxide Salts as Stable Sources of Nucleophilic OCF<sub>3</sub>
作者:Josiah J. Newton、Benson J. Jelier、Michael Meanwell、Rainer E. Martin、Robert Britton、Chadron M. Friesen
DOI:10.1021/acs.orglett.0c00099
日期:2020.3.6
methyl ethers provides quaternaryammonium trifluoromethoxide (NR4OCF3) and pentafluoroethoxide (NR4OCF2CF3) salts, respectively, in good yields. The new trifluoromethoxide salts disclosed herein are uniquely stable for extended periods of time in both the solid state and in solution, which complements contemporary reagents. Here we describe the preparation of a range of NR4OCF3 salts, their long-term stability
Perfluorinated primary alcohol adducts with triethylamine were prepared from lower perfluorinated acid fluorides and triethylamine monohydrofluoride. They are stable compounds and may be used as a source of RFO groups in organic syntheses.
由低级全氟化酰基氟和三乙胺一氢氟化物制备与三乙胺的全氟化伯醇加合物。它们是稳定的化合物,可以用作有机合成中R F O基团的来源。
Concise Total Synthesis of (+)-Crocacin C
作者:Gopal Sirasani、Tapas Paul、Rodrigo B. Andrade
DOI:10.1021/jo800906p
日期:2008.8.1
[GRAPHICS]The cytotoxic natural product (+)-crocacin C (1) has been synthesized in 10 linear steps from commercially available Evans' chiral propionimide. in 5% overall yield (8 steps from Evans' chiral dipropionate synthon). No protecting groups were utilized.