Potassium Phosphate-Catalyzed Chemoselective Reduction of α-Keto Amides: Route to Synthesize Passerini Adducts and 3-Phenyloxindoles
作者:Alagesan Muthukumar、N. Chary Mamillapalli、Govindasamy Sekar
DOI:10.1002/adsc.201500815
日期:2016.2.18
A chemoselective reduction of α‐keto amides to biologically important α‐hydroxy amides (mandelamides) by polymethylhydrosiloxane (PMHS) using 5 mol% potassium phosphate (K3PO4) as catalyst has been developed. This transition metal‐free protocol discloses excellent chemoselectivity for the ketone reduction of α‐keto amides in the presence of other reducible functionalities like ketone, nitro, halides
已开发出使用5 mol%磷酸钾(K 3 PO 4)作为催化剂,通过聚甲基氢硅氧烷(PMHS)将α-酮酰胺化学选择性还原为生物学上重要的α-羟基酰胺(扁桃酰胺)的方法。该无过渡金属方案公开了在存在其他可还原官能团(例如酮,硝基,卤化物,腈和酰胺)的情况下,α-酮酰胺的酮还原反应具有出色的化学选择性。此外,化学选择性还原的α-羟基酰胺已被衍生为无异氰酸酯的Passerini加合物。所述Ñ烷基-α羟基酰胺已经通过用甲磺酰cholride和三乙胺处理被成功地转化为3- phenyloxindole衍生物。