We report the regioselective trifluoromethylation of 1,3-bis(vinyl triflates) via an allyl radical intermediate. In this reaction, the trifluoromethyl radical exclusively attacks the 4-position of the 1,3-diketone derivatives. The observed regioselectivity can be rationalized on the basis of DFT calculations, which suggest that the attack at the 4-position is more favorable than that at the 2-position
Facile access to 1,3-bis(boryl) dienes to build molecular complexity through cycloadditions
作者:Shannon M. Stephens、Jean M. Bray、Shayne M. Weierbach、Gessica M. Adornato、John A. Schrider、Kyle M. Lambert
DOI:10.1016/j.tetlet.2023.154381
日期:2023.3
An operationally simple method to access 1,3-bis(boryl) dienes from parent 1,3-diones via bis-triflation and a Pd0-catalyzed double Miyaura borylation is described. The prepared 1,3-bis(boryl) dienes are bench-stable and competent in [4+2] cycloadditions with common dienophiles affording diastereoselective access to borylated bicyclo[2.2.2]octenes. The addition of LaCl3·2 LiCl, as a mild Lewis acid