62151-56-8Relevant academic research and scientific papers
Cp2ZrMeCl: A Reagent for Asymmetric Methyl Addition
Garrec, Kilian,Fletcher, Stephen P.
, p. 3814 - 3817 (2016/08/16)
The use of Cp2ZrMeCl is described as a source of nucleophilic methyl in asymmetric catalysis. This easily prepared reagent is bench stable, weighable in air, and generally useful in highly enantioselective copper-catalyzed addition reactions at room temperature. Methyl is successfully (generally >90% ee) added in 1,4-additions to cyclic and acyclic α,β-unsaturated ketones to provide tertiary and quaternary centers. Examples of catalyst controlled diastereoselective 1,6-addition and dynamic kinetic asymmetric allylic alkylation reactions are also reported. The reagent is used in the catalytic asymmetric synthesis of naturally occurring fragrance (R)-(-)-muscone (82% yield, 91% ee).
Stereoselective and enantioselective syntheses of the four stereoisomers of muscol from (3RS)-muscone
Yuasa, Yoshifumi,Fukaya, Haruhiko,Yuasa, Yoko
, p. 977 - 982 (2008/02/04)
Two trans stereoisomers of 3-methylcyclopentadecanol (= muscol), (1R,3R)-2 and (1S,3S)-2, were efficiently synthesized from (3RS)-3- methylcyclopentadecanone (= muscone; (3RS)-1) by a highly stereoselective reduction (Scheme). L-Selectride (= lithium tri(sec-butyl)borohydride) was used, followed by the enantiomer resolution by lipase QLG (Alcaligenes sp.). The cis stereoisomers of muscol, (1S,3R)-2 and (1R,3S)-2, were obtained by the Mitsunobu inversion of (1R,3R)-2 and (1S,3S)-2, respectively (Scheme). The absolute configuration of (1R,3R)-2 was determined by X-ray crystal-structure analysis of its 3-nitrophthalic acid monoester, 2-[(1R,3R)-3- methylcyclopentadecyl hydrogen benzene-1,2-dicarboxylate ((1R,3R)-3b), and by oxidation of (1R,3R)-2 to (3R)-muscone.
Synthesis of (R)-(-)-muscone via enzymatic resolution of 3- methylcyclopentadecan-1-ol
Matsumura, Yasufumi,Fukawa, Hidemichi,Terao, Yoshiyasu
, p. 1484 - 1485 (2007/10/03)
(R)-(-)-Muscone was synthesized efficiently by oxidation of 3-(R)- methylcyclopentadecan-1-(RS)-ol, which was obtained by lipase-catalyzed resolution of its diastereomeric mixture.
Homochiral Ketals in Organic Synthesis. Enantioselective Synthesis of (R)-Muscone
Nelson, Keith A.,Mash, Eugene A.
, p. 2721 - 2724 (2007/10/02)
An efficient, enantioselective preparation of (R)-muscone employing a diastereoselective Simmons-Smith cyclopropanation is described.Cyclopropanation is directed via chelation control by a homochiral ketal protecting group derived from unnatural tartaric acid.The overall yield of (R)-muscone (>95percent R) from commercially available cyclopentadecanone is 60percent over seven steps.
