Ruthenium-catalyzed tandem ring closing metathesis (RCM) – atom transfer radical cyclization (ATRC) sequences
摘要:
alpha-omega-Dienes bearing a pendant trichloroacetoxy group undergo a tandem RCM - radical cycloisomerization sequence leading to bicyclic gamma-butyrolactones, with both steps of the sequence being catalyzed by ruthenium. (c) 2005 Elsevier B.V. All rights reserved.
Ruthenium-catalyzed tandem ring closing metathesis (RCM) – atom transfer radical cyclization (ATRC) sequences
摘要:
alpha-omega-Dienes bearing a pendant trichloroacetoxy group undergo a tandem RCM - radical cycloisomerization sequence leading to bicyclic gamma-butyrolactones, with both steps of the sequence being catalyzed by ruthenium. (c) 2005 Elsevier B.V. All rights reserved.
Reaction Control in Synthetic Organic Photochemistry: Switching between [5+2] and [2+2] Modes of Cycloaddition
作者:Claudio Roscini、Kara L. Cubbage、Malcolm Berry、Andrew J. Orr-Ewing、Kevin I. Booker-Milburn
DOI:10.1002/anie.200904059
日期:2009.11.2
Split personality: Reaction conditions that enable powerful control over the mode of photocycloaddition in maleimides have been developed. Direct irradiation favors the [5+2] mode whereas sensitized irradiation allows a complete switch to the [2+2] mode (see scheme; TBS=tert‐butyldimethylsilyl).