Practical synthesis of an orally active renin inhibitor aliskiren
摘要:
A convergent synthesis of aliskiren was accomplished via the use of Segment AB as the key intermediate, which was prepared via the coupling of the Grignard reagent derived from Segment B with Segment A, followed by subsequent oxidative lactonization. (c) 2005 Elsevier Ltd. All rights reserved.
Asymmetric Desymmetrization of 2-Substituted 1,3-Propanediols by Using Oxazaborolidinone-Mediated Enantioselective Ring-Cleavage of Prochiral Acetal Derivatives
作者:Toshiro Harada、Keiko Imai、Akira Oku
DOI:10.1055/s-2002-31928
日期:——
Nonenzymatic desymmetrization of 2-substituted 1,3-propanediols leading to the enantiomerically enriched 3-benzyloxy-1-propanols was achieved by using oxazaborolidinone-mediated enantioselective ring-cleavage reaction of the dioxane acetal derivatives.
Asymmetric Desymmetrization of 2-Substituted 1,3-Propanediols via Catalytic Enantioselective Ring-Cleavage Reaction of Cyclic Acetal Derivatives
作者:Toshiro Harada、Koudai Shiraishi
DOI:10.1055/s-2005-871937
日期:——
Non-enzymatic desymmetrization of 2-substituted 1,3propanediols leading to the enantiomerically enriched 3-benzyloxy-1-propanols was achieved by using oxazaborolidinone-catalyzed enantioselective ring-cleavage reaction ofthe cyclic acetal derivatives with dimethylsilyl ketene S,O-acetal as a key reaction.
Copper-Catalyzed Enantioselective Hydroboration of Unactivated 1,1-Disubstituted Alkenes
作者:Won Jun Jang、Seung Min Song、Jong Hun Moon、Jin Yong Lee、Jaesook Yun
DOI:10.1021/jacs.7b08379
日期:2017.10.4
We report an efficient and highly enantioselectivehydroboration of aliphatic 1,1-disubstitutedalkenes with pinacolborane using a phosphine-Cu catalyst. The method allows facile preparation of enantiomerically enriched β-chiral alkyl pinacolboronates from a range of 1,1-disubstitutedalkenes with high enantioselectivity up to 99% ee. Unprecedented enantiodiscrimination between the geminal alkyl substituents
The Nonchiral Bislactim Diethoxy Ether as a Highly Stereo-Inducing Synthon for Sterically Hindered,γ-Branchedα-Amino Acids: A Practical, Large-Scale Route to an Intermediate of the Novel Renin Inhibitor Aliskiren
The diastereoselective synthesis of the sterically hindered, γ-branched α-amino acidderivative (2S,4S)-24a and its N-[(tert-butoxy)carbonyl](Boc)-protected alcohol (2S,4S)-19, both key intermediates of a novel class of nonpeptide renin inhibitors such as aliskiren (1), is described. Initially, the analogous methyl ester (2S,4S)-17 was obtained by alkylation of the chiral Schöllkopf dihydropyrazine
6-(Aminoalkyl)indazoles of formula (I) and the salts thereof have renin-inhibiting properties and can be used as antihypertensive, and renal, cardiac and vascular protecting medicinally active ingredients.