钾allyltrifluoroborates进行了bora-烯与二氧化硫在不存在路易斯酸催化剂的,得到亚磺酰-三氟硼酸,其随后经历烷基化与亲电子,以产生在砜高达91%产率反应。苄基卤化物和卤代乙酸衍生物可用作烷基化试剂,而Sanger试剂与亚磺酰氧基三氟硼酸酯进行S N Ar反应,生成相应的2,4-二硝基苯砜。所开发的方法允许将烯丙基三氟硼酸钾转化为烯丙基砜。
Enantioselective Rhodium-Catalyzed Nucleophilic Allylation of Cyclic Imines with Allylboron Reagents
作者:Yunfei Luo、Hamish B. Hepburn、Nawasit Chotsaeng、Hon Wai Lam
DOI:10.1002/anie.201204004
日期:2012.8.13
Chiral allylrhodium nucleophiles: The highly diastereo‐ and enantioselective title reaction of a range of cyclic imines with various potassium allyltrifluoroborates most likely proceeds via allylrhodium(I) intermediates, and represents the first rhodium‐catalyzedenantioselective nucleophilic allylation of π electrophiles with allylboron compounds.
An Organotrifluoroborate-Based Convergent Total Synthesis of the Potent Cancer Cell Growth Inhibitory Depsipeptides Kitastatin and Respirantin
作者:Ramsay E. Beveridge、Robert A. Batey
DOI:10.1021/ol500484f
日期:2014.5.2
The total syntheses of the highly cytotoxic neo-antimycin macrocyclic depsipeptide natural products kitastatin and respirantin have been accomplished in a convergent manner using MNBA promoted esterifications and an efficient C- and N-terminus bis-deprotection/HATU promoted macrolactamization. The first examples of using a prenyltrifluoroborate reagent in additions to carbonyl groups are disclosed
The Isomerization of Allylrhodium Intermediates in the Rhodium-Catalyzed Nucleophilic Allylation of Cyclic Imines
作者:Hamish B. Hepburn、Hon Wai Lam
DOI:10.1002/anie.201407233
日期:2014.10.20
Allylrhodium species generated from potassium allyltrifluoroborates can undergo isomerization by 1,4‐rhodium(I) migration to give more complex isomers, which then react with cyclicimines to provide products with up to three new stereochemical elements. High enantioselectivities are obtained using chiral diene–rhodium complexes.
Photo-allylation and photo-benzylation of carbonyl compounds using organotrifluoroborate reagents
作者:Yutaka Nishigaichi、Takayuki Orimi、Akio Takuwa
DOI:10.1016/j.jorganchem.2009.08.011
日期:2009.11
Allyl- and benzyl-trifluoroborates can be applied to the photoreaction of carbonylcompounds to afford the corresponding alcoholic adducts in acceptable yields via a photo-induced single electron transfer pathway. The results were confirmed from the reaction selectivity and the negative free energy change for the electron transfer process.
Total Synthesis of (+)-Prunustatin A: Utility of Organotrifluoroborate-Mediated Prenylation and Shiina MNBA Esterification and Macrolactonization To Avoid a Competing Thorpe–Ingold Effect Accelerated Transesterification
作者:Maja W. Chojnacka、Robert A. Batey
DOI:10.1021/acs.orglett.8b02396
日期:2018.9.21
A convergent totalsynthesis of (+)-prunustatin A is described through the assembly of two key fragments and a macrolactonization. Shiina MNBA couplings were used for the formation of each of the four ester bonds in the tetralactone ring, including the key macrocyclization which was essential to minimize competing Thorpe–Ingold accelerated transesterification. Other key steps included an organoboron-based