Biphenylcarboxylic acid with two competing C(sp(2))-H sites was designed for site selective C(sp(2))-H functionalization by developing carboxylic acids assisted remote and selective olefination via 7-membered palladacycle. Mechanism investigation and DFT calculations reveal a kinetics-determined process, which could be utilized to explore a variety of remote site selectivity. The practicability of this method was highlighted by the precise construction of phenathrene under sequential site selectivity.
243. 3 : 4-Benzfluorenones. Part II. Further observations on the effect of groups on their fission with alkali
作者:Fawzy Ghali Baddar、Munir Gindy
DOI:10.1039/jr9480001231
日期:——
Synthesis of seven-membered lactones by regioselective and stereoselective iodolactonization of electron-deficient olefins
electron-deficient olefinic acids has been reported, which provides a straightforward access to a series of multi-functionalized seven-membered lactones containing two consecutive chiral centers. The ester substituents on the olefins played a key role in achieving high regioselectivity. This result was proved through experiments and DFT calculations.