Regioselective C–H Activation Preceded by Csp2–Csp3 Reductive Elimination from Cyclometalated Platinum(IV) Complexes
摘要:
Reductive elimination reactions of the cyclometalated platinum-(IV) compounds [PtMe2Cl{C6H4CH=NCH2(4-ClC6H4)}L] and [PtMe2Br{C6H4CH=NCH2(C6H5)}L] (L = SMe2, PPh3) to form C-sp3-C-sp2 bonds, followed by either exclusive C H bond activation (L = SMe2) or competition between C-sp2-H and C-sp3-H bond activation (L = PPh3), are reported. Isomerization to give endo products instead of the expected exo complex was observed for the ligand C6H4CH=NCH2(2-BrC6H5), and formation of an endo six-membered platinacycle occurs for the ligand 2,4,6-Me3C6H2CH=NCH2(2-BrC6H4).
A one-pot synthesis of highly substituted tetrahydropyridines from N-benzylidenemethanamines, dialkyl acetylenedicarboxylates and benzylidenemalononitriles
摘要:
A simple and efficient synthesis of highly substituted tetrahydropyridines has been developed using a one-pot, two step reactions. The synthesis of a series of N-benzylidenemethanamines from benzylamines and benzaldehydes in the presence of acetic acid, followed by cyclization with dialkyl acetylenedicarboxylates and benzylidenemalononitriles, gave the corresponding tetrahydropyridines in good yields.
A one-pot synthesis of highly substituted tetrahydropyridines from N-benzylidenemethanamines, dialkyl acetylenedicarboxylates and benzylidenemalononitriles
作者:Hossein Mehrabi、Ahmad Mohebbi
DOI:10.3998/ark.5550190.p009.701
日期:——
A simple and efficient synthesis of highly substituted tetrahydropyridines has been developed using a one-pot, two step reactions. The synthesis of a series of N-benzylidenemethanamines from benzylamines and benzaldehydes in the presence of acetic acid, followed by cyclization with dialkyl acetylenedicarboxylates and benzylidenemalononitriles, gave the corresponding tetrahydropyridines in good yields.
Regioselective C–H Activation Preceded by C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>3</sup></sub> Reductive Elimination from Cyclometalated Platinum(IV) Complexes
作者:Craig M. Anderson、Margarita Crespo、Nicole Kfoury、Michael A. Weinstein、Joseph M. Tanski
DOI:10.1021/om400398g
日期:2013.8.12
Reductive elimination reactions of the cyclometalated platinum-(IV) compounds [PtMe2ClC6H4CH=NCH2(4-ClC6H4)}L] and [PtMe2BrC6H4CH=NCH2(C6H5)}L] (L = SMe2, PPh3) to form C-sp3-C-sp2 bonds, followed by either exclusive C H bond activation (L = SMe2) or competition between C-sp2-H and C-sp3-H bond activation (L = PPh3), are reported. Isomerization to give endo products instead of the expected exo complex was observed for the ligand C6H4CH=NCH2(2-BrC6H5), and formation of an endo six-membered platinacycle occurs for the ligand 2,4,6-Me3C6H2CH=NCH2(2-BrC6H4).