Reactivity of 2-Methylene-1,3-dicarbonyl Compounds. 1,3-Dipolar Cycloaddition Reaction with Ethyl Diazoacetate.
作者:Masashige YAMAUCHI、Masahiko YAJIMA
DOI:10.1248/cpb.49.1638
日期:——
The reaction of 2-methylene-1,3-dicarbonyl compounds (1) with ethyl diazoacetate gave 4,5-dihydro-1H-pyrazole derivatives (2), which were stable for several months at room temperature in good yields.
Stereospecific Assembly of Trisubstituted Alkenes via Photoinduced Nitrogen‐Centered Radical‐Triggered C—C Bond Cleavage/Functionalization of Oxime Esters
作者:Yu Bao、Zhi‐Jie Song、Jin‐Long Dai、Shenghu Yan、Yue Zhang、Jia‐Yin Wang、Guigen Li
DOI:10.1002/cjoc.202300774
日期:2024.6.15
synthesis of trisubstitutedalkenes in moderate to excellent chemical yields (48 examples in total). The reaction of MBH acetates with acyl (indanone) oxime esters afforded trisubstitutedalkenes containing 1,4-dicarbonyl groups. Interestingly, the use of Eosin Y as a photocatalyst in the catalytic system resulted in the formation of distal cyano group-anchored trisubstitutedalkenes via deconstructive
of Morita–Baylis–Hillmanketones with 2-aminothiophenol mediated by Cs2CO3 results in an oxidative cyclization to 2,2-disubstituted dihydro-1,4-benzothiazines, with the structure of the product indicating the occurrence of an aza-Michael addition along the pathway. In contrast, in the absence of a base, the parent compounds interact to produce a thia-Michael adduct instead. A deeper mechanistic study
Morita-Baylis-Hillman 酮与 2-氨基苯硫酚在 Cs 2 CO 3介导下的反应导致氧化环化为 2,2-二取代的二氢-1,4-苯并噻嗪,产物的结构表明氮杂的发生-迈克尔沿着路径添加。相反,在不存在碱的情况下,母体化合物相互作用产生硫杂-迈克尔加合物。更深入的机制研究提高了我们对明显矛盾的理解,并提供了对反应性依赖于碱基的转换的见解。