Theoretical and Experimental Studies of Asymmetric Organozinc Additions to Benzaldehyde Catalyzed by Flexible and Constrained γ-Amino Alcohols
作者:Manoranjan Panda、Puay-Wah Phuan、Marisa C. Kozlowski
DOI:10.1021/jo0262210
日期:2003.1.1
The cis-decalin based gamma-amino alcohols, 1-5, were synthesized, resolved, and employed as catalysts in the addition of organozincs to benzaldehyde. Despite large facial differentiation in the RZn adducts of the ligands, the enantioselectivities were found to be moderate. Transition structure calculations were done using several quantum chemical methods to examine the underlying causes of the selectivity for three gamma-amino alcohols, 1, 2, and 3. The tricyclic mu-oxo (6/4/4), rather than the bicyclic six-membered (6/6), transition structures were found to explain the observed enantioselectivity for 2 and 3. MP2 calculations gave the best correlation to the experimental results compared to B3LYP and HIP calculations. The conformational flexibility of the chiral ligands was found to be an important factor in the selectivity.
MOMOSE T.; UCHIDA S.; KINOSHITA M.; IMANISHI T., CHEM. AND PHARM. BULL. <CPBT-AL>, 1977, 25, NO 7, 1797-1802
作者:MOMOSE T.、 UCHIDA S.、 KINOSHITA M.、 IMANISHI T.
DOI:——
日期:——
[EN] CYCLIC AMIDINE ANALOGS AS INHIBITORS OF NITRIC OXIDE SYNTHASE<br/>[FR] ANALOGUES D'AMIDINES CYCLIQUES UTILISES COMME INHIBITEURS DE LA MONOXYDE D'AZOTE SYNTHETASE
申请人:MERCK & CO., INC.
公开号:WO1996014844A1
公开(公告)日:1996-05-23
(EN) Disclosed herein are the heterocyclic compounds and pharmaceutically acceptable salts thereof which have been found to be useful in the treatment of nitric oxide synthase mediated diseases and disorders.(FR) L'invention concerne des composés hétérocycliques et des sels pharmaceutiquement acceptables de ceux-ci qui se sont montrés utilesdans le traitement des maladies et des troubles liés à la monoxyde d'azote synthétase.
The Action of Sulfuric Acid on γ-Acetylpimelonitriles<sup>1</sup>
作者:C. F. Koelsch、H. M. Walker
DOI:10.1021/ja01157a092
日期:1950.1
Momose,T. et al., Chemical and pharmaceutical bulletin, 1977, vol. 25, p. 1797 - 1802