开发了一种将九氟叔丁氧基结合到各种芳烃中的高效方法。在没有过渡金属催化剂且官能团耐受性和可扩展性良好的情况下,这种C-O交叉偶联反应可以顺利进行。与常规方法相比,该方法避免了使用九氟叔丁醇作为反应溶剂,并且不需要处理有害的重氮盐。制备了一系列针对各种生物相关分析物的19 F NMR基探针的一系列含OC(CF 3)3的类似物。
Synthesis-Guided Structure Revision of the Sarcodonin, Sarcoviolin, and Hydnellin Natural Product Family
作者:David W. Lin、Takeshi Masuda、Moritz B. Biskup、Jonathan D. Nelson、Phil S. Baran
DOI:10.1021/jo102228j
日期:2011.2.18
extensive studies aimed at their chemical synthesis. Key features of revised structure 1b include replacement of the N,N-dioxide moiety with an oxime, ring-opening of the central diketopiperazine, and transposition of the terphenyl wing from the 1β−2β position of 1a to the 2β−3β position of 1b. This structure revision arose from the serendipitous synthesis of a benzodioxane aminal (44) whose structure
作者:Wei W. Chen、Anton Cunillera、Dandan Chen、Sébastien Lethu、Albert López de Moragas、Jun Zhu、Miquel Solà、Ana B. Cuenca、Alexandr Shafir
DOI:10.1002/anie.202009369
日期:2020.11.2
method employs hypervalent (diacetoxy)iodoarenes and proceeds through the iodane‐guided “iodonio‐Claisen” allyl transfer. The use of allylsilanes bearing electron‐withdrawing functional groups unlocks the functionalization of a broad range of substrates, including electron‐neutral and electron‐poor rings. The resulting ortho‐allylated iodoarenes are versatile building blocks, with examples of downstream
The synthesis of N‐arylimidazoles substituted at the sterically encumbered 5‐position is a challenge for modern synthetic approaches. A new family of imidazolyl aryliodonium salts is reported, which serve as a stepping stone on the way to selective formation of N1‐aryl‐5‐iodoimidazoles. Iodine acts as a “universal” placeholder poised for replacement by aryl substituents. These new λ3‐iodanes are produced
作者:James D. White、Giorgio Caravatti、Toni B. Kline、Eric Edstrom、Kenner C. Rice、Arnold Brossi
DOI:10.1016/s0040-4020(01)91965-9
日期:1983.1
The opium alkaloid (−)-codeine was synthesized in eight steps from (±)-N-norreticuline R-(−)-norreticuline, obtained by resolution, was converted to (R)-N-trifluoroacetyl-6'-bromonorreticuline and the latter was subjected to phenolic oxidative coupling with a variety of aryliodoso complexes in dichloromethane. N-Trifluoroacetyl-1-bromonorsalutaridine prepared by this means was transformed to 1-bromosalutaridinol
We herein report a robust catalyst‐free cross‐coupling between ArI(OAc)2 and α‐stannyl nitriles, aided by TMSOTf. The transformation introduces a cyanoalkyl group to the ortho position of ArI(OAc)2 and simultaneously reduces the aryl iodine(III) to iodide, thus providing α‐(2‐iodoaryl) nitrile as the product. This transformation could be completed within 5 min at −78 °C and features superb functional‐group