直接访问药学吸引力苯并稠合的九元杂环烯烃3与三氟甲基甲醇部分达到通过钯催化的双脱羧正式环膨胀过程从六元三氟甲基苯并[ d ] [1,3] oxazinones 1碳酸乙烯基亚乙酯2的存在下,制备成九元三氟甲基苯并[ c ] [1,5]恶唑酮3。有人提出在催化循环中生成Pd-π-烯丙基两性离子中间体。苯并恶嗪酮1中的三氟甲基在整个转型过程中发挥着重要作用。还证明了产物3的非对映选择性化学转化。
carbonates (VECs) with diols has been developed. By using cooperative catalysts of the chiral palladium complex and triethylborane in mild conditions, the process gave monoetherified and bisetherified polyglycol derivatives with tetrasubstituted stereocenters in high yields with complete regioselectivities and high levels of enantio- and diastereoselectivities.
Palladium-Catalyzed Diastereoselective Formal [5 + 3] Cycloaddition for the Construction of Spirooxindoles Fused with an Eight-Membered Ring
作者:Ben Niu、Xiao-Yun Wu、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.9b01748
日期:2019.6.21
A Pd-catalyzed formal [5 + 3] intermolecular cycloaddition reaction of isatin-derived α-(trifluoromethyl)imines with aryl substituted vinylethylene carbonates (VECs) has been reported, affording trifluoromethyl-group-containing spirooxindoles fused with an eight-membered ring as a single diastereoisomer in good yields in the presence of a Brønsted acid in a one-pot manner under mild conditions. The
Pd-Catalyzed Decarboxylative Olefination: Stereoselective Synthesis of Polysubstituted Butadienes and Macrocyclic P-glycoprotein Inhibitors
作者:Bichao Song、Peipei Xie、Yingzi Li、Jiping Hao、Lu Wang、Xiangyang Chen、Zhongliang Xu、Haitian Quan、Liguang Lou、Yuanzhi Xia、K. N. Houk、Weibo Yang
DOI:10.1021/jacs.0c00078
日期:2020.6.3
The efficient and stereoselective synthesis of polysubstituted butadienes, especially the multifunctional butadiene, represents a great challenge in organic synthesis. Herein, we wish to report a distinctive Pd(0) car-bene-initiated decarboxylative olefination approach that enables the direct coupling of diazo esters with vinylethylene carbonates (VECs), vinyl oxazolidinones, or vinyl benzoxazinones
Expedient Dual Co/Organophotoredox Catalyzed Stereoselective Synthesis of All‐Carbon Quaternary Centers
作者:Àlex Cristòfol、Bart Limburg、Arjan W. Kleij
DOI:10.1002/anie.202103479
日期:2021.7.5
An efficient and attractive Co/organophotoredox dualcatalysis protocol has been developed allowing the stereoselective access to a wide variety of syn-configured 1,3-diols featuring quaternary carbon centers. The synthesis of the target molecules is achieved under ambient reaction conditions using modular and accessible reagents, substituted vinyl cyclic carbonates and aldehydes, and in short reaction
Vinylethylene Carbonates as <i>α,β</i>-Unsaturated Aldehyde Surrogates for Regioselective [3 + 3] Cycloaddition
作者:Yi Xu、Lu Chen、Yu-wen Yang、Zhiqiang Zhang、Weibo Yang
DOI:10.1021/acs.orglett.9b02266
日期:2019.9.6
operationally simple [3 + 3] cycloaddition of vinylethylene carbonates with triazinanes. Interestingly, we could also use this method for a [3 + 3] oxidative cycloaddition, which allows the facile synthesis of polysubstituted terphenyls under mild conditions. Mechanistic studies suggest that vinylethylene carbonates could generate α,β-unsaturatedaldehydes as 3-carbon synthons for cycloaddition via a combination