已经开发出一种通过硫醇触发的串联迈克尔加成/分子内亨利反应对 2-硝基苯并呋喃进行有效脱芳环化的方法。一系列硫代苯并[3,2- b ]苯并呋喃-11-醇和四氢噻吩并[3,2- b ]苯并呋喃-3-醇的产率高达 99%,dr 高达 >20:1。 2-硝基苯并呋喃与2-巯基苯甲醛通过串联脱芳香迈克尔加成/分子内亨利反应/重芳香化/氧化脱氢一锅两步操作制备有价值的硫色酮稠合苯并呋喃。初步提出了该反应的机理。
Syntheses of 2-Benzylbenzofuran Derivatives and 2-Aryl-nitrochroman Derivatives from Nitroalkene Precursors
作者:Chia-Yu Huang、Chun-Wei Kuo、Veerababurao Kavala、Ching-Fa Yao
DOI:10.1002/ejoc.201600314
日期:2016.5
the synthesis of 2-benzylbenzofuran, 3-substituted 2-benzylbenzofuran, and 2-aryl-nitrochroman derivatives are described. Benzofurans were generated from nitroalkenes by reduction with NaBH4 followed by a Nef reaction and acid-mediated cyclization, whereas 3-substituted 2-benzylbenzofurans were prepared from nitroalkenes by reactions with Grignard reagents followed by a Nef reaction and an acid-mediated
Photoacid for Extremely Long-Lived and Reversible pH-Jumps
作者:Rui M. D. Nunes、Marta Pineiro、Luis G. Arnaut
DOI:10.1021/ja901930c
日期:2009.7.8
that combines the fast photoacid properties of an aromatic alcohol with the slowprotontransfer rates of a nitroalkane. The protons released in a few nanoseconds by pulsed laser excitation of the photoacid last for nearly one second in aqueoussolutions. We show that acid-base equilibria with other species is established at the lower pHs of the irradiated volume, that the process is reversible and that
DAUZONNE, D.;ROYER, R., SYNTHESIS, BRD, 1984, N 12, 1054-1057
作者:DAUZONNE, D.、ROYER, R.
DOI:——
日期:——
PHOTORESPONSIVE SUNSCREEN COMPOSITION
申请人:Blueshift Pharma GmbH
公开号:EP2467122A2
公开(公告)日:2012-06-27
Photoresponsive Sunscreen Composition
申请人:Walzel Bernd
公开号:US20120148647A1
公开(公告)日:2012-06-14
The present invention relates to a composition containing a sunscreen agent capable of undergoing protonation or deprotonation to form a protonated or deprotonated, respectively, sunscreen agent which absorbs, scatters or reflects more or less UV radiation than it does before being protonated or deprotonated, respectively, and a photoresponsive acid or base generating system which is capable of protonating or deprotonating, respectively, said sunscreen agent when the composition is exposed to UV radiation. Further subject matter of the present invention is a microcapsule comprising a sunscreen agent capable of undergoing protonation or deprotonation to form a protonated or deprotonated, respectively, sunscreen agent which absorbs, scatters or reflects more or less UV radiation than said sunscreen agent does before being protonated or deprotonated, respectively, wherein said sunscreen agent is present in said microcapsule substantially in its protonated or deprotonated form that absorbs, scatters or reflects less UV radiation than said sunscreen agent does upon protonation or deprotonation, respectively. The composition and microcapsule according to the invention are particularly useful for providing sunscreen formulations for cosmetic applications and for providing dermatological formulations for medical applications.