A concise and efficient route to the Alzheimer's therapeutic agent (R)-arundic acid
摘要:
A short and efficient procedure for the preparation of (R)-arundic acid, a therapeutic agent for the treatment of Alzheimer's disease, has been developed. Based an cheap and commercially available (1R)-(+)-camphor as the source of chiral information, (R)-arundic acid is synthesized in a four-step cyclic sequence with 55% overall yield and high optical purity, >= 98% ee. Alkyl halide and acetylene constitute the only consumable carbon Sources of this method, which allows obtaining of both enantiomers and recycling of chiral auxiliary. (C) 2008 Elsevier Ltd. All rights reserved.
Widely Applicable Synthesis of Enantiomerically Pure Tertiary Alkyl-Containing 1-Alkanols by Zirconium-Catalyzed Asymmetric Carboalumination of Alkenes and Palladium- or Copper-Catalyzed Cross-Coupling
for the synthesis of various chiral 2‐alkyl‐1‐alkanols, especially those of feeble chirality, has been developed. It consists of zirconium‐catalyzed asymmetric carboalumination of alkenes (ZACA), lipase‐catalyzed acetylation, and palladium‐ or copper‐catalyzed cross‐coupling. By virtue of the high selectivity factor (E) associated with iodine, either (S)‐ or (R)‐enantiomer of 3‐iodo‐2‐alkyl‐1‐alkanols
已经开发了一种高对映选择性和广泛适用的方法,用于合成各种手性 2-烷基-1-烷醇,尤其是手性弱的那些。它由锆催化的烯烃不对称碳铝化(ZACA)、脂肪酶催化的乙酰化和钯或铜催化的交叉偶联组成。凭借与碘相关的高选择性因子 ( E ),通过烯丙醇的 ZACA 反应制备的 3-碘-2-烷基-1-烷醇 ( 1 ) 的( S )-或 ( R )-对映体可以易于纯化至 ≥ 99 % ee的水平通过脂肪酶催化的乙酰化。多种手性含叔烷基醇,包括那些原本难以制备的醇,现在可以通过 Pd-或 Cu 催化的(S)-1或(R)-2交叉偶联以高对映体纯度合成用于引入各种一级、二级和三级碳基团,同时保留所有碳骨架特征。这些手性含叔烷基的醇可以进一步转化为相应的酸,并完全保留立体化学。该方法的效用的合成已经在高度对映体选择性(≥99%被证明EE)和(高效合成- [R)-2-甲基-1-丁醇和(- [R ) -和(小号)-金黄酸。
[EN] PROCESSES FOR THE SYNTHESIS OF CHIRAL 1-ALKANOLS<br/>[FR] PROCÉDÉS DE SYNTHÈSE DE 1-ALCANOLS CHIRAUX
申请人:PURDUE RESEARCH FOUNDATION
公开号:WO2015106045A1
公开(公告)日:2015-07-16
The invention relates to highly enantioselective processes for the synthesis of chiral 1-alkanols via Zr-catalyzed asymmetric carboalumination of alkenes.
Stereodivergent approach to Alzheimer's therapeutic agent ( R )-(−) and ( S )-(+)-arundic acid employing chiral 4-pentenol derivatives as building blocks
作者:Viraj A. Bhosale、Suresh B. Waghmode
DOI:10.1016/j.tet.2017.03.002
日期:2017.4
An efficient stereodivergent total synthesis of anti-Alzheimeragent (R)-(−) and (S)-(+)-arundic acid has been achieved from both chiral and nonchiral materials. This strategy features an efficient approach to separable diastereomeric C-2 chiral 4-pentenol intermediates employing proline catalysed asymmetric α-aminooxylation and [3,3] sigmatropic Claisen rearrangement are the highlights of present
The invention relates to highly enantioselective processes for the synthesis of chiral 1-alkanols via Zr-catalyzed asymmetric carboalumination of alkenes.
Control of Diastereoselectivity in Orthoester Johnson-Claisen Rearrangement of Tartrate-Based Allyl Alcohol: An Efficient Synthesis of Arundic Acid, a Potential Therapeutic Agent for Alzheimer's Disease
作者:Rodney A. Fernandes、Arun B. Ingle、Dipali A. Chaudhari
DOI:10.1002/ejoc.201101420
日期:2012.2
A diastereoselectiveorthoesterJohnson–Claisenrearrangement has been employed in the synthesis of both enantiomers of arundicacid, a potentialtherapeuticagent against Alzheimer'sdisease. The effect of solvent, olefin geometry and alcohol chirality on the diastereoselectivity of the orthoesterJohnson–Claisenrearrangement of a tartrate-basedallylalcohol has been studied.