Synthesis of Arylglycine and Mandelic Acid Derivatives through Carboxylations of α-Amido and α-Acetoxy Stannanes with Carbon Dioxide
摘要:
Incorporation reactions of carbon dioxide (CO2) with N-Boc-alpha\-amido and a-acetoxy stannanes were developed using CsF as a mild tin activator. Monoprotected alpha-amido stannanes could be used, and the corresponding arylglycine derivatives were obtained in moderate-to-high yields under 1 MPa (10 atm) of CO2 pressure. alpha-Acetoxy stannanes also underwent carboxylation to afford mandelic acid derivatives in excellent yields under ambient CO2 pressure. Both transformations enabled the synthesis of alpha-tertiary and alpha-quaternary carboxylic acid derivatives. In addition, the chirality of (S)-N-tert-butylsulfonyl-alpha-amido stannanes was transferred with up to 90% inversion of configuration at 100 degrees C.
A soluble iron(<scp>ii</scp>)-phthalocyanine-catalyzed intramolecular C(sp<sup>3</sup>)–H amination with alkyl azides
作者:Tingjie You、Si-Hao Zeng、Jianqiang Fan、Liangliang Wu、Fangyuan Kang、Yungen Liu、Chi-Ming Che
DOI:10.1039/d1cc04573c
日期:——
Herein, we describe a soluble iron(II)-phthalocyanine, [FeII(tBu4Pc)(py)2] (Pc = phthalocyaninato(2–)), as an effective catalyst in intramolecularC(sp3)–H bond amination, with alkyl azides as the nitrogen source, to afford the amination products in moderate to excellent yields with a broad substrate scope.
在此,我们描述了一种可溶性铁 ( II )-酞菁 [Fe II ( t Bu 4 Pc)(py) 2 ] (Pc = phthalocyaninato(2-)),作为分子内 C(sp 3 )-H的有效催化剂键胺化,以烷基叠氮化物为氮源,以中等至优异的产率提供胺化产物,底物范围广泛。