Platinum-catalyzed reductive coupling of activated alkenes under hydrogenation conditions
摘要:
The Pt complex generated from PtCl(2), PR(3), and SnCl(2) catalyzes the reductive coupling of activated alkenes under environmentally benign hydrogenation conditions. Various bis-enones participated in the intramolecular cyclization, forming the desired cyclization products in moderate to good yield. Intermolecular reductive coupling of the enone and the aldehyde provided the coupling product in good yield. This methodology illustrates the first use of platinum complexes in hydrogen-mediated couplings of activated alkenes. (C) 2008 Elsevier Ltd. All rights reserved.
Visible-light promoted de Mayo reaction by zirconium catalysis
作者:Wenzhao Zhang、Sanzhong Luo
DOI:10.1039/d2cc05029c
日期:——
Zirconium catalysis with ZrCl4 was developed to facilitate a de Mayo reaction under visible light conditions without any external photosensitizer and additive.
开发了具有 ZrCl 4的锆催化以促进可见光条件下的 de Mayo 反应,而无需任何外部光敏剂和添加剂。
Photocycloaddition of 1,3-Diphenyl-N-methyl Enaminoketonatoboron Difluoride with Simple Olefins
作者:Kuniaki Itoh、Kazuhiko Okazaki、Yoshito Toyotomi
DOI:10.3987/com-02-9575
日期:——
The photoaddition of some cyclic and acyclicolefins to (N-B)-Z-1-difluoroboryloxy-1,3-diphenyl-3-methylimino-1-propene (BF 2 -complex (1)) is discussed. Some of the resulting [2+2] photoadducts produce cyclobutane derivatives having cis configurations. The rearrangements of the cyclobutanes give pyridinium salts and 1,5-diketones. Reaction schemes for the formation of the cyclobutanes are presented