Stereoselective Synthesis of the C(1)−C(11) Fragment of Peloruside A
作者:Robert M. Owen、William R. Roush
DOI:10.1021/ol0514303
日期:2005.9.1
the C(1)-C(11) fragment 4 of peloruside A has been accomplished via a stereoselective double allylboration and an intramolecular epoxide opening to provide the functionally dense C(3)-C(11) segment 14. A glycolate aldol reaction was then employed to introduce the remaining stereocenters at C(2)-C(3). [reaction: see text]
Asymmetric reduction of ketoxime derivatives and N-alkylketimines with borane–oxazaborolidine adducts
作者:Marek P. Krzemiński、Marek Zaidlewicz
DOI:10.1016/s0957-4166(03)00314-8
日期:2003.6
Oxime ethers of acetophenone, isopropyl methyl ketone, and tert-butyl methyl ketone were reduced to the corresponding hydroxylamine ethers of 45-94% ee with borane-oxazaborolidine 1 derived from (-)-norephedrine. A one-pot reduction of acetophenone oxime with 1 to 1-phenylethylhydroxylamine of 87% ee is described. The reduction of 6-methyl-2,3,4,5-tetrahydropyridine and N-methylimines of the above mentioned ketones with borane-B-methyloxazaborolidine adduct 2, derived from (-)-diphenylprolinol, gave the corresponding amines of 40-74% ee. (C) 2003 Elsevier Science Ltd. All rights reserved.
RACHERLA, UDAY S.;BROWN, HERBERT C., J. ORG. CHEM., 56,(1991) N, C. 401-404
作者:RACHERLA, UDAY S.、BROWN, HERBERT C.
DOI:——
日期:——
Molecular addition compounds. 14. Convenient preparations of representative dialkylborane reagents using the new, highly reactive N-ethyl-N-isopropylaninine-borane reagent (BACH-EI™)
作者:Herbert C. Brown、Josyula V.B. Kanth、Marek Zaidlewicz
DOI:10.1016/s0040-4020(99)00272-0
日期:1999.5
Convenient procedures for the preparation of representative dialkylborane reagents, diisopinocampheylborane, [1S]-2-diisocaranylborane, 9-borabicyclo[3,3,1]nonane, dicyclohexylborane and disiamylborane, using the new, highly reactive N-ethyl-N-isopropylaniline-borane reagent (BACH-EI™) in dioxane and tetrahydrofuran are described.