Copper-Catalyzed Oxyazidation of Unactivated Alkenes: A Facile Synthesis of Isoxazolines Featuring an Azido Substituent
摘要:
A novel and efficient Cu(OAc)(2)-catalyzed oxyazidation of unactivated alkenes was developed. The reactions are easy to conduct, occur under mild conditions, and form azido-substituted isoxazolines in good yields.
TMG-promoted [3 + 2] organocatalytic 1,3-dipolarcycloaddition reactions of allyl ketones with in situ generated nitrileoxides have been developed. This strategy could generate 3,5-disubstituted isoxazolines in high yields and regioselectivities.
Direct access to 1,2,3-triazoles through organocatalytic 1,3-dipolar cycloaddition reaction of allyl ketones with azides
作者:Wenjun Li、Zhiyun Du、Jiayao Huang、Qianfa Jia、Kun Zhang、Jian Wang
DOI:10.1039/c4gc00406j
日期:——
A general organocatalytic 1,3-dipolarcycloadditionreaction between allyl ketones and various azides is reported. The reaction is catalyzed by a secondary amine to generate substituted 1,2,3-triazoles with high levels of regioselectivity.
Organocatalytic Asymmetric Vinylogous Aldol Reaction of Allyl Aryl Ketones to Silyl Glyoxylates
作者:Man-Yi Han、Wen-Yu Luan、Pei-Lin Mai、Pinhua Li、Lei Wang
DOI:10.1021/acs.joc.7b02546
日期:2018.2.2
A direct organocatalytic asymmetric vinylogous aldol reaction of allyl aryl ketones to silyl glyoxylates has been developed through the bifunctional catalyst, giving the α-hydroxysilanes with excellent enantioselectivity (up to 95% ee) and in high yields (up to 96%). The success of this catalytic methodology offers an opportunity to tackle the problems in the nucleophilic addition to acylsilanes. To
A visible-light-induced dioxygenation of β,γ-unsaturatedoximes for the synthesis of diverse useful isoxazolines bearing a hydroxyl moiety was developed by employing graphitic carbon nitride (g-C3N4) as a heterogeneous photocatalyst under an air atmosphere. Noted that, the eminent advantages of this metal-free protocol include step economy, easy operation, a recyclable photocatalyst, external reductant-/oxidant-free
通过在空气气氛下使用石墨氮化碳 (gC 3 N 4 ) 作为非均相光催化剂,开发了一种可见光诱导的β , γ -不饱和肟的双氧合,用于合成各种有用的带有羟基的异恶唑啉。值得注意的是,这种无金属协议的显着优势包括步骤经济、易于操作、可回收的光催化剂、外部还原剂/氧化剂和温和的反应条件。此外,机理研究表明,在 gC 3 N 4的光催化作用下会产生羟基自由基。
Highly Enantio- and Diastereoselective Allylic Alkylation of Morita–Baylis–Hillman Carbonates with Allyl Ketones
The asymmetric allylic alkylation of Morita–Baylis–Hillman (MBH) carbonates with allyl ketones has been developed. The α-regioselective alkylation adducts, containing a hexa-1,5-diene framework with important synthetic value, were achieved in up to 83% yield, >99% ee, and 50:1 dr by using a commercially available Cinchonaalkaloid as the catalyst. From the allylic alkylation adduct, a cyclohexene bearing