Studies on a catalytic version of the Matteson asymmetric homologation reaction
作者:Keith Smith、Basil A. Saleh、Mohammed B. Alshammari、Gamal A. El-Hiti、Mark C. Elliott
DOI:10.1039/d1ob00604e
日期:——
Studies of a catalyticasymmetric version of the Matteson reaction between dichloromethylboronates and organolithium reagents have been undertaken. From several different chiral catalytic systems studied, only one based on a mannitol derivative has given substantial asymmetric induction close to that previously achieved with a bis(oxazoline) derivative and ytterbium triflate. More detailed study of
Diastereoselective Borocyclopropanation of Allylic Ethers Using a Boromethylzinc Carbenoid
作者:Guillaume Benoit、André B. Charette
DOI:10.1021/jacs.6b09090
日期:2017.2.1
borocyclopropanation of (E)- and (Z)-allylic ethers and styrene derivatives via the Simmons-Smith reaction using a novel boromethylzinc carbenoid is described. The carbenoid precursor is prepared via a 3-step sequence from inexpensive and commercially available starting materials. This methodology allows for the preparation of 1,2,3-substituted borocyclopropanes in high yields and diastereoselectivities
Borocyclopropanation of Styrenes Mediated by UV-light Under Continuous Flow Conditions
作者:Morgane Sayes、Guillaume Benoit、André B. Charette
DOI:10.1002/anie.201807347
日期:2018.10.8
Herein, we report a user‐friendly and metal‐free UV‐A light mediated borocyclopropanation of styrenes using continuousflow technology. A broad range of styrene derivatives can be cyclopropanated in good yields within 1 h residence time to produce highly valuable cyclopropylboronate esters with modest to good diastereoselectivities. The reaction is also applicable to α‐substituted styrenes. Mechanistic
Synthesis and antimicrobial activity of <i>α</i>
-aminoboronic-containing peptidomimetics
作者:Olga V. Gozhina、John Sigurd Svendsen、Tore Lejon
DOI:10.1002/psc.2583
日期:2014.1
tripeptidomimetics containing an α‐amino boronic acid or boronate has been synthesized, and the activity toward Mycobacterium tuberculosis, Candida albicans, Staphylococcus aureus, Streptococcus pyogenes, Escherichia coli and Pseudomonas aeruginosa has been screened. Although there is no clear structure–activity relationship, several compounds exhibit promising activity against different pathogens. Copyright
Catalytic Asymmetric Total Syntheses of Quinine and Quinidine
作者:Izzat T. Raheem、Steven N. Goodman、Eric N. Jacobsen
DOI:10.1021/ja039550y
日期:2004.1.28
The catalytic, asymmetric syntheses of quinine and quinidine were achieved in 16 steps. The recently developed salen(Al)-catalyzed enantioselective Michael addition of methyl cyanoacetate served to set the crucial C4 stereocenter in 92% ee, and a late-stage asymmetric dihydroxylation was used to differentiate the common intermediate and access the two desired diastereomeric products with high selectivity