319439-95-7Relevant academic research and scientific papers
New general method for regio- and stereoselective allylic substitution with aryl and alkenyl coppers derived from grignard reagents
Kiyotsuka, Yohei,Katayama, Yuji,Acharya, Hukuni P.,Hyodo, Tomonori,Kobayashi, Yuichi
experimental part, p. 1939 - 1951 (2009/08/07)
Allylic substitution with sp2-carbon reagents (aryl and alkenyl anions) was realized by using allylic picolinates and copper reagents derived from RMgBr and CuBr-Me2S to afford anti SN2 products regioand stereoselectively. Steric and electronic factors in the reagents and the size of the methylene substituents around the allylic moiety marginally affected the selectivity. The reaction system was compatible with alkyl reagents as well. Furthermore, the substitution was applied to construction of a quaternary center and synthesis of (-)-sesquichamaenol. Electron-withdrawing nature of the pyridyl group and chelation of the C(=O)-C5H4N to MgBr2 generated in situ were found to be responsible for the high efficiency of the substitution.
Reptilian chemistry: Enantioselective syntheses of novel components from a crocodile exocrine secretion
Yang,Attygalle,Meinwald
, p. 1936 - 1943 (2007/10/03)
Enantioselective syntheses of the two naturally-occurring diastereomers of dianeackerone (1a and 1b) and of a closely related steroidal β-oxo ester (2), characterized from the paracloacal glandular secretion of the African dwarf crocodile, Osteolaemus tetraspis, are described.
