What Controls Stereoselectivity and Reactivity in the Synthesis of a trans-Decalin with a Quaternary Chiral Center via the Intramolecular Pauson–Khand Reaction: A Theoretical Study
摘要:
The Co-2(CO)(8)-mediated intramolecular PausonKhand reaction is an efficient approach to the trans-decalin subunit with a defined C1 quaternary chiral center. The newly developed density functional theory method M11-L was employed to study the mechanism, reactivity, and stereoselectivity for this reaction. The rate- and stereoselectivity-determining step is the intramolecular alkene insertion into the carboncobalt bond. Insertion of the alkene by the re- and si-face was studied to explain the stereoselectivity. The effects of varying the substituent on the acetylene and the C3 chirality were investigated experimentally and theoretically.
Development of an expedient intramolecular Pauson–Khand reaction approach to stereoselectively construct the trans-decalin with a C1 quaternary chiral center