Enantioselective Synthesis of Spiropentanes from Hydroxymethylallenes
作者:André B. Charette、Eric Jolicoeur、Gregory A. S. Bydlinski
DOI:10.1021/ol0165140
日期:2001.10.1
[reaction: see text]. Hydroxymethylallenes are efficiently converted to the corresponding spiropentanes in high yields and enantiomeric ratios upon treatment with Zn(CH2I)2 and dioxaborolane ligand 1. The reaction also proceeds with complete diastereocontrol. The application of this methodology to the synthesis of spiropentaneacetic acid is also presented.
Nickel-Catalyzed Chemo- and Enantioselective Coupling between Cyclobutanones and Allenes: Rapid Synthesis of [3.2.2] Bicycles
作者:Xuan Zhou、Guangbin Dong
DOI:10.1002/anie.201609489
日期:2016.11.21
Herein an intramolecular nickel‐catalyzed (4+2) coupling between cyclobutanones and allenes, by C−C cleavage, is reported. The reaction provides a distinct approach for accessing [3.2.2] bicyclic scaffolds which are challenging to prepare through conventional approaches. The reaction is efficient, chemoselective, and pH/redox neutral. Room temperature conditions and low catalyst loadings can be adopted
Rhodium-Catalyzed Intermolecular Stereoselective Allylation of Indoles with Allenes
作者:Chaoyan Ma、Can Li、Jiahui Bai、Junzhe Xiao、Yizhan Zhai、Yinlong Guo、Shengming Ma
DOI:10.1021/acscatal.2c01433
日期:2022.8.19
rhodium-catalyzed C–H functionalization-based intermolecular allylation of indoles with trisubstituted allenes has been developed. This synthetic process proceeds with an excellent regioselectivity, Z-selectivity, high efficiency of chirality transfer, and a wide tolerance of reactive functional groups under mild conditions. Late-stage modification on a series of complex bioactive or drug molecules and
Observation of New Cycloisomerization Pattern of 1,5-Bisallenes. Catalyst and Substituent Effects
作者:Ping Lu、Shengming Ma
DOI:10.1021/ol070632r
日期:2007.5.1
In this paper a new cycloisomerization pattern of 1,5-bisallenes based on the catalyst and substituent effects has been reported. A range of seven-membered cross-conjugated trienes 7 would be obtained efficiently via the beta-H elimination and reductive elimination of the intermediates formed via cycloisomerization.
Regioselective and in Some Cases Stereoselective Carbonylation of .alpha.-Allenic Alcohols to .alpha.-Vinylacrylic Acids Catalyzed by a Cationic Palladium Complex
作者:Marcelo E. Piotti、Howard Alper
DOI:10.1021/jo00087a002
日期:1994.4
trans-[(Cy(3)P)(2)Pd(H)(H2O)](BF4-)-B-+, in the presence of p-toluenesulfonic acid, catalyzes the carbonylation of cu-allenic alcohols to alpha-vinylacrylic acids in 43-74% yields.