One-Pot Carboboration of Alkynes Using Lithium Borylcyanocuprate and the Subsequent Suzuki-Miyaura Cross-Coupling of the Resulting Tetrasubstituted Alkenylborane
作者:Yuri Okuno、Makoto Yamashita、Kyoko Nozaki
DOI:10.1002/ejoc.201100373
日期:2011.7
We have developed a one-potcarboboration of internal alkynes using lithium borylcyanocuprates 3. Isolation of single crystals of 3·(thf)3 enabled us to estimate its structural and spectroscopic features. Simple mixing of 3 with ester-substituted alkynes and alkynylarenes was followed by trapping of the resulting intermediate with electrophiles to give tetrasubstituted borylalkenes 4, 5, and 8 in moderate
Phosphanyl Cyanophosphide Salts: Versatile PCN Building Blocks
作者:Zhongshu Li、Jaap E. Borger、Fabian Müller、Jeffrey R. Harmer、Cheng‐Yong Su、Hansjörg Grützmacher
DOI:10.1002/anie.201904720
日期:2019.8.12
preparation of alkali salts of phosphanyl cyanophosphides [NHP‐PCN]− (NHP=N‐heterocyclic phosphenium) is reported. Their formation is achieved by isoelectronic replacement of O for [N]− in the phosphaketenes NHP‐PCO using alkaline hexamethyldisilazide M[N(SiMe3)2] (M=Na, K) as reagent. The new anionic entities are versatile PCN buildingblocks which allow the formation of a diversity of new cyanophosphine
Synthesis of a hydrogen-bridged tetraborane(6): a substituent effect of a diaminoboryl group toward the B–B multiple bond character
作者:Atsumi Yagi、Haruki Kisu、Makoto Yamashita
DOI:10.1039/c9dt01117j
日期:——
structural and spectroscopic analyses of the tetraborane(6) revealed σ-donor and π-acceptor effects of diaminoboryl substituents toward the central B–B moiety having a multiple bond character. DFT calculations also supported the experimentally observed substituenteffect of the boryl group.
Facile C−F Bond Activation Approach to FAMT‐Based Difluoromethyl‐BNCT Drug Candidates
作者:Akitaka Yokawa、Miho Hatanaka、Koichi Mikami
DOI:10.1002/hlca.202000211
日期:2021.2
2‐diazaborolidinyl‐2‐uide activates the C−F linkage of fluoroform (CF3H) to provide air‐stable difluoromethylborane compounds. Computational analysis of SN2‐type transition state for the C−Fbondactivation of fluoroform with boryllithium clarifies the mechanism involving the lithium dimeric species in the pre‐reaction complex. FAMT (=3‐fluoro‐l‐α‐methyl‐tyrosine)‐baseddifluoromethyl‐BNCT (boron neutron capture
1,3-双(2,6-二异丙基苯基)-1,3,2-二氮杂硼烷基-2-脲可活化氟仿(CF 3 H)的C-F键,以提供稳定的二氟甲基硼烷化合物。S N 2型过渡态对氟硼酸与硼酸锂的CF键活化的计算分析,阐明了反应前复合物中涉及锂二聚体物质的机理。FAMT(= 3-氟升-α甲基-酪氨酸)基二氟甲基- BNCT(硼中子俘获治疗)的药物候选因此由本C-F键活化产生。
π-Delocalization in phosphaphthalimide and its ambident reactivity (O/P) toward main-group electrophiles
作者:Qi Shen、Jiashi Xu、Xiaodan Chen
DOI:10.1039/d2dt01163h
日期:——
phosphorus analogue of the phthalimide anion, dates back to forty years ago. However, the presence of π-delocalization between two-coordinated phosphorus centre and neighbouring carbonyl groups in 1 has been underestimated. Herein, sodium salts of 1 were obtained through a convenient procedure on a relatively large scale with a modified procedure. Reactivity studies demonstrated that 1 is indeed a