Pd(II)-catalyzed hydroalkynylation, alkyne-allene isomerization, and Diels–Alder cycloaddition is reported. The reaction employs readily available starting substrates, proceeds in a highly ordered fashion, features high regio- and stereoselectivity, and tolerates a wide range of functionality and structural motifs, thus offering an attractive strategy for producing new molecular complexity and diversity from easily
Direct scandium- and lanthanum-catalyzed etherifications of propargyl alcohols 1 and 6 in MeNO2–H2O provided propargyl ethers 3, 4 and 7 in high yields. In addition, reactions of 1 and 6 with thiols exclusively yielded the corresponding propargyl sulfides.
PMA‐SiO<sub>2</sub>: A Heterogenous Catalyst for <i>O</i>‐, <i>S</i>‐, and <i>N</i>‐Nucleophilic Substitution Reactions of Aryl Propargyl Alcohols
作者:P. Srihari、J. Shyam Sunder Reddy、Dinesh C. Bhunia、S. S. Mandal、J. S. Yadav
DOI:10.1080/00397910801914335
日期:2008.4
Abstract Aryl‐propargylic alcohols undergo O‐, S‐, and N‐nucleophilicsubstitutionreactions in the presence of a catalytic amount of PMA‐SiO2.
摘要 芳基-炔丙醇在催化量的 PMA-SiO2 存在下发生 O-、S-和 N-亲核取代反应。
A Domino Sequence Consisting of Insertion, Coupling, Isomerization, and Diels-Alder Steps Yields Highly Fluorescent Spirocycles
作者:Daniel M. D'Souza、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/anie.200461489
日期:2005.1
Synthesis, Structure and Emission Properties of Spirocyclic Benzofuranones and Dihydroindolones: A Domino Insertion–Coupling–Isomerization– Diels–Alder Approach to Rigid Fluorophores
作者:Daniel M. D'Souza、Alexander Kiel、Dirk-Peter Herten、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/chem.200700759
日期:2008.1.7
far thermodynamically and kinetically favored over a possible Claisenrearrangement. Compounds of this new class of spirocyclic compounds possess large Stokes shifts and fluoresce intensively with blue over green to orange colors. As a consequence of the spirocyclic rigidity fluorescence lifetimes and quantum yields are rather high in some cases.