Rhodium-Catalyzed Arylative Cyclization for the Enantioselective Synthesis of (Trifluoromethyl)cyclobutanols
作者:Thomas Johnson、Ken-Loon Choo、Mark Lautens
DOI:10.1002/chem.201404896
日期:2014.10.27
A rhodium‐catalyzedcyclization of 1‐(trifluoromethyl)‐4‐alkyn‐1‐ones with arylboronic acids is described to yield a novel class of small rings: (trifluoromethyl)cyclobutanols bearing an exocyclic double bond. The use of a rhodium/chiraldienecomplex allowed the reaction to proceed under mild conditions, often with high enantioselectivity. An X‐ray crystal structure was obtained confirming the formation
A Pauson−Khand-Type Reaction between Alkynes and Olefinic Aldehydes Catalyzed by Rhodium/Cobalt Heterobimetallic Nanoparticles: An Olefinic Aldehyde as an Olefin and CO Source
作者:Kang Hyun Park、Il Gu Jung、Young Keun Chung
DOI:10.1021/ol049765s
日期:2004.4.1
Co/Rh (Co:Rh = 2:2) heterobimetallic nanoparticles derived from Co(2)Rh(2)(CO)(12) react with alkynes and alpha,beta-unsaturated aldehydes such as acrolein, crotonaldehyde, and cinnamic aldehyde and release products resulting from [2 + 2 + 1]cycloaddition of alkyne, carbon monoxide, and alkene. alpha,beta-Unsaturated aldehydes act as a CO and alkene source. These reactions produce 2-substituted cyclopentenones
作者:Juliet M. Alderson、Alicia M. Phelps、Ryan J. Scamp、Nicholas S. Dolan、Jennifer M. Schomaker
DOI:10.1021/ja5094309
日期:2014.12.3
The development of readily tunable and regioselective C-H functionalization reactions that operate solely through catalyst control remains a challenge in modern organic synthesis. Herein, we report that simple silver catalysts supported by common nitrogenated ligands can be used to tune a nitrene transfer reaction between two different types of C-H bonds. The results reported herein represent the first example of ligand-controlled and site-selective silver-promoted C-H amination.
(η2-Propene)Ti(O-i-Pr)2-mediated cyclization of allenynol derivatives which leads to a stereoselective preparation of cyclic cross-conjugated trienes
作者:Takanori Yamazaki、Hirokazu Urabe、Fumie Sato
DOI:10.1016/s0040-4039(98)01573-1
日期:1998.10
Treatment of allenynol derivatives with (eta(2)-propene)Ti(O-i-Pr)(2) afforded the title compounds which are a possible starting material for the diene-transmissive Diels-Alder reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.