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CAMDOL-enabled diastereoselective synthesis of α-substituted phosphonates
Chemical Communications ( IF 4.3 ) Pub Date : 2024-01-12 , DOI: 10.1039/d3cc05436e
Yu Huang 1 , Yulong Zhang 1 , Li Pan 1 , Qian Wu 1 , Ning Li 1 , Enxue Shi 1 , Junhua Xiao 1
Affiliation  

Enantiopure α-substituted phosphonic acids are widely utilized as drugs, pesticides, and ligands. Despite numerous synthetic approaches having been investigated, precise construction of P-adjacent chiral tertiary carbon centres by the employment of recoverable chiral auxiliaries is traditional and still one of the most reliable and practical synthetic methodologies so far. Herein, we present a highly diastereoselective synthesis of α-substituted phosphonates via the unique CAMDOL-derived P-substrates by an efficient sequential deprotonation with LiHMDS and alkylation/arylation with RI. A wide range of 30 structurally diverse α-substituted phosphonate products, including the well-known P-analogues of naproxen and ibuprofen, were thus afforded conveniently in up to 92% yields and 99 : 1 diastereomeric ratios. The related chiral phosphonic acid could be easily obtained by simple acidic hydrolysis with fully recovered auxiliary. This CAMDOL-enabled asymmetric synthetic protocol exhibits comparative advantages over known chiral-induction methods with easy accessibility and compatibility of furnishing a variety of C-stereogenic centres in the proximity of the phosphorus atom, including some rare examples.

中文翻译:


CAMDOL 支持的 α-取代膦酸酯的非对映选择性合成



对映体纯α-取代膦酸广泛用作药物、农药和配体。尽管已经研究了许多合成方法,但通过使用可回收的手性助剂来精确构建P-相邻手性叔碳中心是传统的,并且仍然是迄今为止最可靠和实用的合成方法之一。在此,我们通过独特的 CAMDOL 衍生的 P-底物,通过 LiHMDS 的有效连续去质子化和 RI 的烷基化/芳基化,提出了 α-取代膦酸酯的高度非对映选择性合成。因此,可以方便地以高达 92% 的产率和 99:1 的非对映异构体比例方便地提供 30 种结构多样的 α-取代膦酸酯产品,包括众所周知的萘普生和布洛芬的 P-类似物。在完全回收助剂的情况下,通过简单的酸水解可以很容易地获得相关的手性膦酸。这种支持 CAMDOL 的不对称合成方案与已知的手性诱导方法相比具有比较优势,并且易于获取,并且在磷原子附近提供各种 C-立体中心(包括一些罕见的例子)。
更新日期:2024-01-12
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