A convenient procedure for the direct conversion of terminal alkenes into carboxylic acids
摘要:
Alkylboronic acids, readily synthesized from a variety of representative terminal alkenes via hydroboration with dibromoborane-methyl sulfide, undergo a facile oxidation with chromium trioxide in 90% aqueous acetic acid to provide carboxylic acids in 80-97% isolated yields, without rearrangement or loss of carbon.
P1 Phenethyl peptide boronic acid inhibitors of HCV NS3 protease
摘要:
A series of peptide boronic acids containing extended, hydrophobic P1 residues was prepared to probe the shallow, hydrophobic S1 region of HCV NS3 protease. The p-trifluoromethylphenethyl P1 substituent was identified as optimal with respect to inhibitor potency for NS3 and selectivity against elastase and chymotrypsin. (C) 2002 Published by Elsevier Science Ltd.
Practical and Modular Construction of C(sp<sup>3</sup>)-Rich Alkyl Boron Compounds
作者:Yangyang Yang、Jet Tsien、Ayala Ben David、Jonathan M. E. Hughes、Rohan R. Merchant、Tian Qin
DOI:10.1021/jacs.0c11964
日期:2021.1.13
Alkyl boronic acids and esters play an important role in the synthesis of C(sp3)-rich medicines, agrochemicals, and material chemistry. This work describes a new type of transition-metal-free mediated transformation to enable the construction of C(sp3)-rich and sterically hindered alkyl boron reagents in a practical and modular manner. The broad generality and functional group tolerance of this method
Visible-Light-Mediated Aerobic Oxidation of Organoboron Compounds Using in Situ Generated Hydrogen Peroxide
作者:Wei-Zhi Weng、Hao Liang、Bo Zhang
DOI:10.1021/acs.orglett.8b02095
日期:2018.8.17
A simple and general visible-light-mediated oxidation of organoboroncompounds has been developed with rose bengal as the photocatalyst, substoichiometric Et3N as the electron donor, as well as air as the oxidant. This mild and metal-free protocol shows a broad substrate scope and provides a wide range of aliphatic alcohols and phenols in moderate to excellent yields. Notably, the robustness of this
Cross-coupling reactions of primary alkylboronic acids with aryl triflates and aryl halides
作者:Gary A. Molander、Chang-Soo Yun
DOI:10.1016/s0040-4020(02)00009-1
日期:2002.2
The cross-coupling reactions of primaryalkylboronicacids with aryl triflates and aryl halides has been successfully achieved using PdCl2(dppf)·CH2Cl2 in the presence of potassium carbonate to provide the corresponding Suzuki coupled products in high yields.
Copper-Promoted Trifluoromethylation of Primary and Secondary Alkylboronic Acids
作者:Jun Xu、Bin Xiao、Chuan-Qi Xie、Dong-Fen Luo、Lei Liu、Yao Fu
DOI:10.1002/anie.201206681
日期:2012.12.7
New couple: The Cu‐promoted trifluoromethylation of primary and secondaryalkylboronicacids with TMSCF3 extends the scope of transition‐metal‐catalyzed trifluoromethylation reactions to sp3‐hybridized carbon centers. It also represents one of the first examples for Cu‐catalyzed CC cross‐coupling reactions of alkylboronicacid derivatives.
Coupling of Trifluoroacetaldehyde <i>N</i>-Triftosylhydrazone with Organoboronic Acids for the Synthesis of <i>gem</i>-Difluoroalkenes
作者:Yu Ma、Bhoomireddy Rajendra Prasad Reddy、Xihe Bi
DOI:10.1021/acs.orglett.9b03740
日期:2019.12.20
synthesis of alkyl gem-difluoroalkenes remains a difficult task in organic synthesis. Here, we report a general and efficient approach for tackling this problem by gem-difluoroolefination of trifluoroacetaldehyde N-triftosylhydrazone with organoboronic acids. This protocol is operationally simple, free of transition metals, and suitable for a broad range of organoboronic acids. Moreover, the utility