The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer
摘要:
The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer is reported. The seven-step route to these two polyacetylenes in enantiomerically pure form involves the use of (+)-2,3-O-isopropylidene-L-threitol and (-)-2,3-O-isopropylidene-D-threitol, respectively, as the starting material and a Cadiot-Chodkiewicz reaction as a key step. The absolute configuration of (+)-gymnasterkoreayne F has been confirmed to be (2E,8S,Z). The natural product and its enantiomer have been found to exhibit modest cytotoxicity against the 60 human tumor cell lines of the National Cancer Institute. (C) 2005 Elsevier Ltd. All rights reserved.
The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer
摘要:
The first total synthesis of naturally occurring (+)-gymnasterkoreayne F and its enantiomer is reported. The seven-step route to these two polyacetylenes in enantiomerically pure form involves the use of (+)-2,3-O-isopropylidene-L-threitol and (-)-2,3-O-isopropylidene-D-threitol, respectively, as the starting material and a Cadiot-Chodkiewicz reaction as a key step. The absolute configuration of (+)-gymnasterkoreayne F has been confirmed to be (2E,8S,Z). The natural product and its enantiomer have been found to exhibit modest cytotoxicity against the 60 human tumor cell lines of the National Cancer Institute. (C) 2005 Elsevier Ltd. All rights reserved.
Enantioselective Nickel‐Catalyzed Migratory Hydrocyanation of Nonconjugated Dienes
作者:Rongrong Yu、Shanmugam Rajasekar、Xianjie Fang
DOI:10.1002/anie.202008854
日期:2020.11.23
Metal‐catalyzed chain‐walking reactions have recently emerged as a powerful strategy to functionalize remote positions in organic molecules. However, a chain‐walking protocol for nonconjugated dienes remains scarcely reported, and developments are currently ongoing. In this Communication, a nickel‐catalyzed asymmetric hydrocyanation of nonconjugated dienes involving a chain‐walking process is demonstrated
Total Synthesis of <i>cis</i>-Solamin: Exploiting the RuO<sub>4</sub>-Catalyzed Oxidative Cyclization of Dienes
作者:Hülya Göksel、Christian B. W. Stark
DOI:10.1021/ol060520k
日期:2006.8.1
text] An enantioselective totalsynthesis of cis-solamin has been accomplished using a highly diastereoselective ruthenium tetroxide catalyzed oxidative cyclization as a crucial transformation. Further key steps involved an enzymatic desymmetrization, a TPAP-catalyzed oxidative termini differentiation, and a ruthenium-catalyzed Alder-ene reaction. Thus, the totalsynthesis of cis-solamin was achieved
Enantioselective Palladium‐Catalyzed Directed Migratory Allylation of Remote Dienes
作者:Xian‐Xiao Chen、Hao Luo、Ye‐Wei Chen、Yang Liu、Zhi‐Tao He
DOI:10.1002/anie.202307628
日期:2023.8.21
The enantioselective migratory allylation of remote dienes via palladium-catalyzed simultaneous/directed chain walking is reported. The transformation provides a potential route to achieving stereoselective functionalization of multiple continuous C(sp3)−H bonds.
A shelf-stable water-borne dispersion or solution that cures rapidly and at low temperatures when coated onto a substrate can be prepared with an aqueous-based solution or stable aqueous dispersion of a polymer having a backbone containing pendant silanol groups which are sufficiently neutralized to inhibit silanol condensation.