Sequential Platinum‐Catalyzed Cycloisomerization and Cope Rearrangement of Dienynes
作者:Sun Young Kim、Youjung Park、Young Keun Chung
DOI:10.1002/anie.200905361
日期:2010.1.8
Enyne‐enyne‐o: Tandem cycloisomerization of dienynescatalyzed by platinum dichloride and subsequent Coperearrangement affords bicyclic rings (see scheme; Z=NTs, O, CH2), such as bicyclo[3.2.2]nonadienes 1 or tetrahydrocyclohepta[c]pyrans and ‐pyridines 2, in high yields.
烯炔-烯炔:二氯化铂催化的二烯的串联环异构化和随后的Cope重排提供双环(见方案; Z = NTs,O,CH 2),例如双环[3.2.2]壬二烯1或四氢环庚基[ c ]吡喃和吡啶2,高产。
Reciprocal-Activation Strategy for Allylic Sulfination with Unactivated Allylic Alcohols
A reciprocal-activation strategy for allylic sulfination with unactivated allylicalcohols was developed. In this reaction, the hydrogen bond interaction between allylicalcohols and sulfinic acids allowed for reciprocal activation, which enabled a dehydrative cross-coupling process to occur under mild reaction conditions. This reaction worked in an environmentally friendly manner, yielding water as
An unusual intramolecular Diels–Alder approach toward maoecrystal V
作者:Patrick Carberry、Dennis R. Viernes、Lydia B. Choi、Mark W. Fegley、John D. Chisholm
DOI:10.1016/j.tetlet.2013.01.075
日期:2013.3
IntramolecularDiels–Alderreactions are commonly employed for the synthesis of polycyclic natural products, but the use of aldehydes as dienophiles is an underexplored facet of the intramolecularcycloaddition. The intramolecular nature of this reaction allowed the use of aldehydes as dienophiles without the use of highly activated dienes, as is often necessary for intermolecular Diels–Alder reactions
Expedient Synthesis of Fused Azepine Derivatives Using a Sequential Rhodium(II)-Catalyzed Cyclopropanation/1-Aza-Cope Rearrangement of Dienyltriazoles
作者:Erica E. Schultz、Vincent N. G. Lindsay、Richmond Sarpong
DOI:10.1002/anie.201405356
日期:2014.9.8
reported. The process involves an intramolecular cyclopropanation of an α‐imino rhodium(II) carbenoid, leading to a transient 1‐imino‐2‐vinylcyclopropane intermediate which rapidly undergoes a 1‐aza‐Coperearrangement to generate fused dihydroazepine derivatives in moderate to excellent yields. The reaction proceeds with similar efficiency on gram scale. The use of catalyst‐free conditions leads to the formation
报道了一种从带有系链二烯的 1-磺酰基-1,2,3-三唑形成稠合二氢氮杂卓衍生物的一般方法。该过程涉及 α-亚氨基铑 (II) 类卡宾的分子内环丙烷化,产生短暂的 1-亚氨基-2-乙烯基环丙烷中间体,该中间体迅速发生 1-氮杂-Cope 重排,以中等至优异的产率生成稠合二氢氮杂卓衍生物。该反应在克规模上以类似的效率进行。使用无催化剂条件导致形成新的 [4.4.0] 双环杂环。
New Irregular Monoterpenes in<i>Artemisia vulgaris</i>
A gas chromatographic investigation of the steam distilled oil of the herb of Artemisia vulgaris led to the identification of 21 irregularmonoterpenes of non-head-to-tail isoprenoid skeleton. The spectral data of some of these compounds are discussed. The structures of eight newirregularmonoterpenes are given.