Double Michael Addition Reactions of the Nazarov Reagent with 2-Cyano-2-Cycloalkenones: An Alternative Approach to cis-Fused Bicyclic Systems
作者:Hsing-Jang Liu、Min-Tsang Hsieh、Che-Hao Tu、Yen-Ku Wu、Kak-Shan Shia、Sheng-Chu Kuo
DOI:10.1055/s-0033-1340299
日期:——
A highly stereoselective annulation reaction of 2-cyano-2-cycloalkenones with the Nazarov reagent catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), leading to densely functionalized bicyclic systems, is developed.
Conia-ene annulation of the α-cyano β-TMS-capped alkynyl cycloalkanone system and its synthetic application
作者:Chih-Lung Chin、Cheng-Feng Liao、Hsing-Jang Liu、Ying-Chieh Wong、Ming-Tsang Hsieh、Prashanth K. Amancha、Chun-Ping Chang、Kak-Shan Shia
DOI:10.1039/c1ob05591g
日期:——
Under catalysis with ZnI2, an effective annulation process of Ï-silylacetylenic α-cyano ketones, leading to the formation of various bicyclic frameworks characterized with a TMS-containing methylenecyclopentane ring, has been developed.
Autoxidative Annulation Cascade of the α-Cyano β-TMS-capped Alkynyl Cycloalkanone System
作者:Ying-Chieh Wong、Min-Tsang Hsieh、Prashanth K. Amancha、Chih-Lung Chin、Cheng-Feng Liao、Chun-Wei Kuo、Kak-Shan Shia
DOI:10.1021/ol102947u
日期:2011.3.4
The autoxidative annulation cascade promoted by an a.-cyano beta-TMS-capped alkynyl cycloalkanone system under catalysis with pyridine in one oxygen atmosphere has proven to be highly viable. On the basis of this newly developed protocol, a variety of highly functionalized bicyclic frameworks can be effectively constructed.
K2CO3/NaI-Induced Cyclization of ω-Bromo α-Cyano Ketones: A New Annulation Approach for the Formation of Carbalkoxycyclohexane Ring System
作者:Hsing-Jang Liu、Min-Tsang Hsieh、Che-Hao Tu、Kak-Shan Shia、Sheng-Chu Kuo
DOI:10.1055/s-0031-1290386
日期:2012.7
An operationally simple and highly effective annulation process, making use of ZnCl2-catalyzed Michael addition and K2CO3/NaI-induced cyclization as key manipulations, has been developed to construct various bicyclic systems with a high level of functionalization valuable for further synthetic elaboration.
The first total synthesis of xenitorins B and C: assignment of absolute configuration
Starting from (-)-beta-pinene, the firsttotalsynthesis of xenitorins B and C has been accomplished, which also allowed the assignment of their absolute configuration.