@article{JosSzwetkowskiSlebodnicketal.2022,
  author    = {Jos, Swetha and Szwetkowski, Connor and Slebodnick, Carla and Ricker, Robert and Chan, Ka Lok and Chan, Wing Chun and Radius, Udo and Lin, Zhenyang and Marder, Todd B. and Santos, Webster L.},
  title     = {Transition Metal-Free Regio- and Stereo-Selective trans Hydroboration of 1,3-Diynes: A Phosphine-Catalyzed Access to (E)-1-Boryl-1,3-Enynes},
  series = {Chemistry - A European Journal},
  volume    = {28},
  journal   = {Chemistry - A European Journal},
  number    = {63},
  doi       = {10.1002/chem.202202349},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-293784},
  year      = {2022},
  abstract  = {We report a transition metal-free, regio- and stereo-selective, phosphine-catalyzed method for the trans hydroboration of 1,3-diynes with pinacolborane that affords (E)-1-boryl-1,3-enynes. The reaction proceeds with excellent selectivity for boron addition to the external carbon of the 1,3-diyne framework as unambiguously established by NMR and X-ray crystallographic studies. The reaction displays a broad substrate scope including unsymmetrical diynes to generate products in high yield (up to 95 \%). Experimental and theoretical studies suggest that phosphine attack on the alkyne is a key process in the catalytic cycle.},
  language  = {en}
}
@article{LiuMingLuoetal.2020,
  author    = {Liu, Xiaocui and Ming, Wenbo and Luo, Xiaoling and Friedrich, Alexandra and Maier, Jan and Radius, Udo and Santos, Webster L. and Marder, Todd B.},
  title     = {Regio- and Stereoselective Synthesis of 1,1-Diborylalkenes via Br{\o}nsted Base-Catalyzed Mixed Diboration of Alkynyl Esters and Amides with BpinBdan},
  series = {European Journal of Organic Chemistry},
  volume    = {2020},
  journal   = {European Journal of Organic Chemistry},
  number    = {13},
  doi       = {10.1002/ejoc.202000128},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-214728},
  pages     = {1941 -- 1946},
  year      = {2020},
  abstract  = {The NaOtBu-catalyzed mixed 1,1-diboration of terminal alkynes using the unsymmetrical diboron reagent BpinBdan (pin = pinacolato; dan = 1,8-diaminonaphthalene) proceeds in a regio- and stereoselective fashion affording moderate to high yields of 1,1-diborylalkenes bearing orthogonal boron protecting groups. It is applicable to gram-scale synthesis without loss of yield or selectivity. The mixed 1,1-diborylalkene products can be utilized in Suzuki-Miyaura cross-coupling reactions which take place selectivly at the C-B site. DFT calculations suggest the NaOtBu-catalyzed mixed 1,1-diboration of alkynes occurs through deprotonation of the terminal alkyne, stepwise addition of BpinBdan to the terminal carbon followed by protonation with tBuOH. Experimentally observed selective formation of (Z)-diborylalkenes is supported by our theoretical studies.},
  language  = {en}
}