357952-91-1Relevant academic research and scientific papers
The silylalkyne-prins cyclization: Stereoselective synthesis of tetra- and pentasubstituted halodihydropyrans
Miranda, Pedro O.,Ramirez, Miguel A.,Martin, Victor S.,Padron, Juan I.
, p. 1633 - 1636 (2007/10/03)
A new type of Prins cyclization using silylated secondary homopropargylic alcohols and aldehydes yielding tetra- and pentasubstituted dihydropyrans is described. The presence of the trimethylsilyl group in the triple bond favors the Prins cyclization and
Convenient synthesis of optically active 1,2-diol monosulfonates and terminal epoxides via oxazaborolidine-catalyzed asymmetric borane reduction of α-sulfonyloxy ketones
Cho, Byung Tae,Yang, Weon Ki,Choi, Ok Kyung
, p. 1204 - 1211 (2007/10/03)
A very convenient asymmetric synthesis of 1,2-diol monosulfonates and terminal epoxides with high optical purity via oxazaborolidine-catalyzed asymmetric borane reduction of α-sulfonyloxy ketones using N-ethyl-N-isopropylaniline-borane complex as borane carrier has been developed.
Early transition metal alkoxide complexes bearing homochiral trialkanolamine ligands
Nugent, William A.,Harlow, Richard L.
, p. 6142 - 6148 (2007/10/02)
Enantiomerically pure trialkanolamines of the formula N(CH2CHROH)3, where R = methyl (3a), cyclohexyl (3b), teri-butyl (3c), or phenyl (3d), are readily synthesized by the reaction of ammonia with 3 equiv of an enantiopure epoxide. Trialkanolamines 3a-d replace n-propanol in tri-n-propyl vanadate to afford corresponding complexes 4a-d of the formula LV=O, where L is the deprotonated trialkanolamine. Similarly, (S,S,S)-triisopropanolamine 3a reacts with Ti(OiPr)4 to produce monomeric LTi(OiPr), 7a, which upon treatment with acetyl chloride gives the chloro complex LTiCl, 7b. The later group 5 ethoxides react with 3a to produce LM(OEt)2 (M = Nb, Ta). Partial hydrolysis of the Nb and Ta derivatives produces tetrameric μ-oxo-bridged structures which retain the trialkanolamine ligands. In all complexes the transition metal resides in a highly asymmetric environment, suggesting that this class of complexes may find use in the field of asymmetric catalysis. The X-ray crystal structures of complexes 4c and 7b are reported.
