A New Method of Deuterium Incorporation to TMS-Epoxyalcohol Using Sodium Methylsulfinylmethylide-d5 (NaDMSO-d5)
摘要:
A reaction of 1-TMS-1,2-epoxyoctan-3-ol with NaDMSO-d(5) (Na+ CD3S(O)CD2-), prepared in situ from DMSO-d(6) and NaH, afforded non-1-ene-1,1-d(2)-3,4-diol. Both the anti and syn isomers showed similar reactivity and the stereochemistry was preserved. alpha-Ethoxyethyl ether of the epoxy alcohol was converted to the corresponding mono-ethoxyethyl ether of the 1-ene-3,4-diol. Hydroboration and hydrogenation of the corresponding TBS ethers afforded compounds with the "CH2CD2OH" and "CH2CD2H" groups, respectively.
Synthesis of γ,δ,-unsaturated α-amino acids from allylsilanes and glycidyl cation equivalents
作者:Hendrik H. Mooiweer、Henk Hiemstra、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)89098-0
日期:——
The synthesis of a series of γ,δ-unsaturated N-protected α-amino acid methyl esters from the coupling of different allylsilanes and glycidyl cation equivalents 6 and 7 is described. Reactions with methoxyglycine derivative 6 are induced with BF3·OEt2; in the case of chloroglycine derivative 7 SnCl4 is used as Lewis acid. Reactions are fully regioselective, but show low stereoselectivity. The conversion
Hexafluoroisopropanol as a Unique Solvent for Stereoselective Iododesilylation of Vinylsilanes
作者:Elizabeth A. Ilardi、Craig E. Stivala、Armen Zakarian
DOI:10.1021/ol800341z
日期:2008.5.1
Stereoselective preparation of iodoalkenes from vinylsilanes is described. 1,1,1,3,3,3-HexafluoroisopropanoI serves as a unique solvent that ensures high yields and stereoselectivities in the lododesilylation of a variety of functionalized substrates.