Ti-Catalyzed Radical Alkylation of Secondary and Tertiary Alkyl Chlorides Using Michael Acceptors
2018-10-10T00:00:00Z (GMT) by
Alkyl chlorides are common functional groups in synthetic organic chemistry. However, the engagement of unactivated alkyl chlorides, especially tertiary alkyl chlorides, in transition-metal-catalyzed C–C bond formation remains challenging. Herein, we describe the development of a Ti<sup>III</sup>-catalyzed radical addition of 2° and 3° alkyl chlorides to electron-deficient alkenes. Mechanistic data are consistent with inner-sphere activation of the C–Cl bond featuring Ti<sup>III</sup>-mediated Cl atom abstraction. Evidence suggests that the active Ti<sup>III</sup> catalyst is generated from the Ti<sup>IV</sup> precursor in a Lewis-acid-assisted electron transfer process.