Selective reductions. 53. Asymmetric reduction of α-fluoromethyl ketones with B-chlorodiisopinocampheylborane and B-isopinocampheyl-9-borabicyclo[3.3.1]nonane. Combined electronic and steric contributions to the enantiocontrol process
作者:P.Veeraraghavan Ramachandran、Aleksandar V. Teodorovic'、Baoqing Gong、Herbert C. Brown
DOI:10.1016/0957-4166(94)80057-x
日期:1994.6
A systematic study of the asymmetricreduction of aryl and alkyl α-fluoroalkyl ketones with (−)-diisopinocampheylchloroborane ((−)-DIP-Chloride, 1), and (−)-B-isopinocampheyl-9-borabicyclo[3.3.1]nonane (R-Alpine-Borane, 2) has been made. In the case of reagent 1, the direction of asymmetric induction in the chiral reduction of aryl trifluoromethyl ketones differs from that of the corresponding mono-
670. Organic fluorine compounds. Part XXI. α-Fluorinated keto-compounds
作者:Ernst D. Bergmann、Sasson Cohen、Eliahu Hoffman、Zafrira Rand-Meir
DOI:10.1039/jr9610003452
日期:——
Toxic Fluorine Compounds. XV.<sup>1</sup> Some ι-Fluoro-β-Ketoesters and ι-Fluoroketones
作者:R. R. Fraser、J. E. Millington、F. L. M. Pattison
DOI:10.1021/ja01565a053
日期:1957.4
Gold-Catalyzed Addition of <i>N</i>-Hydroxy Heterocycles to Alkynes and Subsequent 3,3-Sigmatropic Rearrangement
作者:Manish Kumar、Martin Scobie、Mark S. Mashuta、Gerald B. Hammond、Bo Xu
DOI:10.1021/ol4000789
日期:2013.2.15
Gold-catalyzed intermolecular addition of hydroxybenzotriazole derivatives to alkynes at room temperature, gives vinyl ethers 3 in high yields and with excellent regioselectivity. Unlike many other vinyl ethers, 3 can easily be purified by regular silica-gel chromatography. On heating, 3,3-sigmatropic rearrangement of 3 gives access to highly functionalized benzotriazoles. This two-step sequence represents an efficient oxygen transfer protocol which incorporates a nucleophilic oxygen atom Into an alkyne group. Reaction of 3 with an electrophilic fluorinating reagent (Selectfluor) gives a fluorinated ketone regioselectively and in high yield.
Surya Prakash; Hu; Olah, Journal of Fluorine Chemistry, 2001, vol. 112, # 2, p. 357 - 362