Regioselective Amine–Borane Cyclization: Towards the Synthesis of 1,2‐BN‐3‐Cyclohexene by Copper‐Assisted Triazole/Gold Catalysis
作者:Stephen E. Motika、Qiaoyi Wang、Novruz G. Akhmedov、Lukasz Wojtas、Xiaodong Shi
DOI:10.1002/anie.201604986
日期:2016.9.12
as the optimal catalytic system for promoting intramolecular hydroboration for the synthesis of a six‐membered cyclic amine–borane. Excellent yields (up to 95 %) and regioselectivities (5‐exo vs. 6‐endo) were achieved through catalyst control and sequential dilution. Good functional‐group tolerance was attained, thus allowing the preparation of highly functionalized cyclic amine–borane substrates,
三唑/金(TA-Au)和Cu(OTf)2的组合被认为是促进分子内氢硼化合成六元环胺-硼烷的最佳催化体系。通过催化剂控制和顺序稀释,获得了极高的收率(高达95%)和区域选择性(5-exo vs. 6-endo)。获得了良好的官能团耐受性,因此可以制备高度官能化的环胺-硼烷底物,而这是其他方法无法实现的。氘标记研究支持在金活化炔烃中加入氢化物并随后形成C-B键。
Accessing alternative reaction pathways of the intermolecular condensation between homo-propargyl alcohols and terminal alkynes through divergent gold catalysis
作者:Courtney A. Smith、Stephen E. Motika、Lukasz Wojtas、Xiaodong Shi
DOI:10.1039/c6cc09794d
日期:——
An intermolecular condensation of alkynols and terminal alkynes is reported. Using IPrAuNTf2, an efficient Au-catalyzed cyclization-alkynylation strategy furnishes (2-arylalkynyl) cyclic ethers in moderate to excellent yields (up to 94%). This...
据报道,炔醇和末端炔烃发生分子间缩合。使用 IPrAuNTf2,一种有效的 Au 催化环化-炔基化策略可以以中等至优异的产率(高达 94%)提供(2-芳基炔基)环醚。这...
A new strategy to construct a CC–CF3 subunit via CuBr-catalyzed domino reaction of homopropargyl amines: an efficient synthesis of trifluoromethyl containing building blocks 4-trifluoromethyl-2,3-dihydro-pyrroliums
A new strategy for the construction of a CCâCF3 subunit has been developed via CuBr-catalyzed domino cyclizationâtrifluoromethylation of homopropargyl amines with Umemoto's reagent. 4-Trifluoromethyl-2,3-dihydro-pyrroliums were produced in high yields. The usefulness of these products has been demonstrated by the transformation of them into various other trifluoromethylated molecules.
Intermolecular Homopropargyl Alcohol Addition to Alkyne and a Sequential 1,6-Enyne Cycloisomerization with Triazole-Gold Catalyst
作者:Seyedmorteza Hosseyni、Lukasz Wojtas、Minyong Li、Xiaodong Shi
DOI:10.1021/jacs.6b00882
日期:2016.3.30
While gold-catalyzed homopropargyl alcohol cyclization is a known process, a triazole-gold catalyst prevented the intramolecular cyclization in the presence of terminal alkynes. As a result, an intermolecular addition to an alkyne was achieved. A sequential 1,6-enyne cycloisomerization gave the unusual 2,3-dihydrooxepine, which revealed another new reaction path. Diels-Alder reaction of oxepine followed