A Thermal Dehydrogenative Diels–Alder Reaction of Styrenes for the Concise Synthesis of Functionalized Naphthalenes
作者:Laura S. Kocsis、Erica Benedetti、Kay M. Brummond
DOI:10.1021/ol301938z
日期:2012.9.7
Functionalized naphthalenes are valuable building blocks in many important areas. A microwave-assisted, intramolecular dehydrogenative Diels–Alderreaction of styrenyl derivatives to provide cyclopenta[b]naphthalene substructures not previously accessible using existing synthetic methods is described. The synthetic utility of these uniquely functionalized naphthalenes was demonstrated by a single-step
功能化萘是许多重要领域的宝贵组成部分。描述了苯乙烯基衍生物的微波辅助分子内脱氢 Diels-Alder 反应,以提供以前使用现有合成方法无法获得的环戊二烯 [ b ] 萘亚结构。通过将这些环加合物之一一步转化为与 Prodan 结构相似的荧光团,证明了这些独特功能化萘的合成效用。
SYNTHESIS, STRUCTURE AND USE OF FUNCTIONALIZED NAPHTHALENES
申请人:Brummond Key M.
公开号:US20130310558A1
公开(公告)日:2013-11-21
Methods for the synthesis and use of functionalized, substituted naphthalenes are described. The functionalized, substituted naphthalenes display useful properties including liquid crystals and fluorescence properties, such as solvatochromatic fluorescence, with high quantum yields, Stoke's shift, and show emission maxima that are significantly red-shifted.
Rhodium-Catalyzed Regio- and Enantioselective Addition of <i>N</i>-Hydroxyphthalimide to Allenes: A Strategy To Synthesize Chiral Allylic Alcohols
作者:Zi Liu、Bernhard Breit
DOI:10.1021/acs.orglett.7b03709
日期:2018.1.5
We achieved the first Rh-catalyzed regio- and enantioselectiveadditions of N-hydroxyphthalimide to allenes. This transformation is accomplished via mild reaction conditions, leveraging on Josiphos SL-J003-2 as a chiral ligand to furnish branched O-allyl compounds in good yields with moderate to excellent enantioselectivities. The substrate scope is broad, and various functional groups are tolerated
Microwave-Assisted Intramolecular [2 + 2] Allenic Cycloaddition Reaction for the Rapid Assembly of Bicyclo[4.2.0]octa-1,6-dienes and Bicyclo[5.2.0]nona-1,7-dienes
作者:Kay M. Brummond、Daitao Chen
DOI:10.1021/ol051115g
日期:2005.8.1
[2 + 2] cycloaddition reaction. This cycloaddition provides an efficient route to bicyclomethylenecyclobutenes. The reaction occurs with complete regioselectivity for the distal double bond of the allene for the selective formation of a variety of hetero- and carbocyclic substrates. Bicyclo[4.2.0]octadienes and bicyclo[5.2.0]nonadienes have been prepared in high yield. [reaction: see text]
Transition-Metal-Catalyzed Regiodivergent and Stereoselective Access to Branched and Linear Allylated 4-Pyridones
作者:Johannes P. Schmidt、Changkun Li、Bernhard Breit
DOI:10.1002/chem.201701382
日期:2017.5.11
A regiodivergent and stereoselective transition‐metal‐catalyzed addition of 4‐pyridones to allenes furnishing N‐allylated pyridones is reported. Employing a commercially available chiral rhodium catalyst enabled enantioselective branched‐selective allylation. Conversely, an achiral palladium catalyst led to linear‐selective N‐allylation in high E‐selectivities. A wide range of functional groups was