A Diastereoselective Intramolecular Hydroamination Approach to the Syntheses of (+)-, (±)-, and (−)-Pinidinol
摘要:
A diastereoselective, lanthanocene-catalyzed, intramolecular hydroamination reaction was applied to the preparation of 2,6-disubstituted piperidines. Various metal/ligand arrays in the catalysts were examined using a model substrate to allow optimization of the diastereoselectivity. It was determined that the relationship between metal size and ligand bulk plays an integral role in the transformation. The complex Cp*2NdCH(TMS)(2) converted 2-substituted 8-nonen-4-amines to 2,6-disubsituted piperidines with greater than 100:1 selectivity for the formation of the cis isomer. A short synthesis of pinidinol, an alkaloid isolated from various pine and spruce species, was then carried out to exploit this stereoselective reaction.
Highly potent, orally active diester macrocyclic human renin inhibitors
作者:Ann E. Weber、Mark G. Steiner、Philip A. Krieter、Adria E. Colletti、James R. Tata、Thomas A. Halgren、Richard G. Ball、John J. Doyle、Terry W. Schorn
DOI:10.1021/jm00099a004
日期:1992.10
moiety of inhibitor 4o with a variety of substituents led to subnanomolar inhibitors, one of which (the "3(S)-quinuclidinyl-Phe" derivative 33) lowered blood pressure 20 mmHg and completely inhibited plasma renin activity for 6 h in sodium-depleted rhesus monkeys. This compound proved to have limited bioavailability (1% in rats) due to cleavage of the serine ester bond and rapid hepatic extraction.
A Diastereoselective Intramolecular Hydroamination Approach to the Syntheses of (+)-, (±)-, and (−)-Pinidinol
作者:Gary A. Molander、Eric D. Dowdy、Shawn K. Pack
DOI:10.1021/jo015603n
日期:2001.6.1
A diastereoselective, lanthanocene-catalyzed, intramolecular hydroamination reaction was applied to the preparation of 2,6-disubstituted piperidines. Various metal/ligand arrays in the catalysts were examined using a model substrate to allow optimization of the diastereoselectivity. It was determined that the relationship between metal size and ligand bulk plays an integral role in the transformation. The complex Cp*2NdCH(TMS)(2) converted 2-substituted 8-nonen-4-amines to 2,6-disubsituted piperidines with greater than 100:1 selectivity for the formation of the cis isomer. A short synthesis of pinidinol, an alkaloid isolated from various pine and spruce species, was then carried out to exploit this stereoselective reaction.