New discoveries in chemical research and development in 2021. We’ll be discussing some of the latest developments in chemical about CAS: 214894-89-0,HPLC of Formula: C9H9BrO2, In a article, mentioned the application of 214894-89-0, molecular formula is C9H9BrO2
We report a one-step, Ru(II)-catalyzed cyclopropanation reaction that is conceptually different from the previously reported protocols that include Corey-Chaykovsky, Simmons-Smith, and metal-catalyzed carbene attack on olefins. Under the current protocol, various alcohols and esters are transformed into sulfone substituted cyclopropanes with excellent isolated yields and diastereoselectivities. This new reaction forms highly congested cyclopropane products with three new C-C bonds, three or two new chiral centers and one new quaternary carbon center. Twenty-two examples of isolated substrates are given. Previously reported synthetic routes for similar substrates are all multistep, linear routes that proceed with overall low yields and poor control of stereochemistry. Commercially available Ru(II) dehydrogenation catalysts, that were recently developed for the dehydrogenative synthesis of esters and amides from alcohol and amine substrates, were used in the reaction, with the best catalyst showing excellent activity at 0.2-1 mol % catalyst loading. Mechanistic investigation showed that in the case of alcohol substrates, the catalyst is only responsible for the first dehydrogenation step, and that the identity of the base and the countercation is crucial in achieving high yields. The catalyst is also required for the cyclopropanation of esters, although no dehydrogenation can proceed in this case, suggesting that substrates sensitive to H2 may be acylated prior to reaction.
I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 214894-89-0, help many people in the next few years.Application In Synthesis of 5-(Bromomethyl)-2,3-dihydro-1,4-benzodioxine