作者:Sureshbabu Dadiboyena、Jianping Xu、Ashton T. Hamme
DOI:10.1016/j.tetlet.2006.12.005
日期:2007.2
The regioselectivesynthesis of 3,5-disubstitutedisoxazoles was achieved through the 1,3-dipolar cycloaddition of nitrile oxides with 1,1-disubstituted bromoalkenes. The substituted bromoalkenes function as alkyne synthons which were used to construct 5,5-disubstituted bromoisoxazoline intermediates that aromatize to the analogous isoxazoles through the loss of HBr.
[3 + 2] Cycloaddition of nitrile oxides to dichloropropenes and 1,3‐dichlorobut‐2‐ene: A regioselectivity issue
作者:Alexandra N. Shilova、Nina S. Shatokhina、Evgeniy V. Kondrashov
DOI:10.1002/jhet.4787
日期:2024.4
The reaction of nitrileoxides with 2,3-dichloroprop-1-ene, 1,3-dichloroprop-1-ene, and 1,3-dichlorobut-2-ene leads to 5-(chloromethyl)isoxazoles, 4-(chloromethyl)isoxazoles, or to mixtures of both regioisomers. The direction of cycloaddition and reactivity of substrate is determined by the steric hindrance at the terminal carbon atom of the alkene double bond. It has been found that the isomeric products