Total Synthesis of Caerulomycin C via the Halogen Dance Reaction
摘要:
[GRAPHICS]The total synthesis of caerulomycin C is described. Key steps in this synthesis utilize 1,2-, 1,3-, and 1,4-halogen dance reactions for the functionalization of the pyridine ring.
Metalation of Aryl Iodides, Part II: Directed Ortho-Lithiation of 3-Iodo-N,N-diiospropyl-2-pyridinecarboxamide: Halogen-Dance and Synthesis of an Acyclic Analogue of Meridine
An original one-pot synthesis of 5-(4-pyridyl)-benzo[c]-2,7-naphthyridine as key intermediate in the synthesis of amphimedine by metalation connected with cross-coupling reaction
short new route to 4,5-disubstituted-benzo[c]-2,7-naphthyridines has been developed. The strategy involves directed ortho metalation of pyridines following by an halogen dance reaction and biaryl cross-coupling as key steps. A concise and efficient one-pot synthesis of 4-chloro-5-(4-pyridyl)-benzo[c]-2,7-naphthyridine, as a key intermediate in the synthesis of amphimedine is described.
Pd-Catalyzed Dynamic Kinetic Enantioselective Arylation of Silylphosphines
作者:Vincent S. Chan、Robert G. Bergman、F. Dean Toste
DOI:10.1021/ja076457r
日期:2007.12.1
Palladium-catalyzed cross-couplings represent a powerful method for the formatioil of new bonds. A catalytic, enantioselective P-C bond-forming reaction proceeding via a Pd-mediated arylation of silylphosphines was developed for the synthesis of P-stereogenic phosphines. These useful and synthetically challenging phosphines can be made with a variety of functionalized aryl iodides; however, they proceed most enantioselectively with 2-iodo-N ,N -diisopropylbenzamides.