Stereospecific Synthesis of (+)- and (−)-Cyclooctenone Derivatives Using a Ring Expansion Reaction with Me<sub>3</sub>SiSnBu<sub>3</sub> and CsF
作者:Alice Emi Imai、Yoshihiro Sato、Mayumi Nishida、Miwako Mori
DOI:10.1021/ja983168h
日期:1999.2.1
Novel synthesis of an eight-membered compound by the ringexpansion reaction of a two-carbon unit was developed using the stannyl anion generated from Me3SiSnBu3 and CsF in DMF. cis- and trans-cyclooctenone derivatives were synthesized from cyclohexanone derivatives having vinyl iodide in a tether by treatment with Me3SiSnBu3 and CsF in DMF in a stereospecific manner. The trans-cyclooctenone derivative
Chiral base mediated transformation of cyclic 1,3-diketones
作者:Benjamin Butler、Thomas Schultz、Nigel S. Simpkins
DOI:10.1039/b606864b
日期:——
Treatment of certain 1,3-diketones with a chiral lithium amide base results in the formation of a non-racemic lithium mono-enolate; these intermediates can be transformed directly into chiral hydroxyketone products by reduction with DIBAL-H in high yield and with selectivities of up to 99% ee.
CuH-Catalyzed Enantioselective Desymmetrization of Cyclic 1,3-Diketones
作者:Vaibhav B. Patil、Sandip B. Jadhav、Jagadeesh Babu Nanubolu、Rambabu Chegondi
DOI:10.1021/acs.orglett.2c03359
日期:2022.11.11
cyclopentane-1,3-diones to access cyclic 3-hydroxy ketones having an all-carbonquaternarycenter with high diastereoselectivity via hydrosilylation using PMHS as an inexpensive hydride source. This reaction displays high functional group tolerance including reducible alkyne, alkene, and ester groups with a broad substrate scope. The importance of chiral cyclic 3-hydroxy ketone building blocks was also demonstrated
在此,我们报告了 CuH 催化的前手性环戊烷-1,3-二酮的不对称去对称化,使用 PMHS 作为廉价的氢化物源,通过氢化硅烷化反应获得具有全碳季中心和高非对映选择性的环状 3-羟基酮。该反应显示出高官能团耐受性,包括具有广泛底物范围的可还原炔烃、烯烃和酯基团。手性环状 3-羟基酮结构单元的重要性也通过 (-)-雌酮、毒柯烯烷 E 核心和稠合吲哚的合成得到证明。
Asymmetric microbial reduction of prochiral 2,2,-disubstituted cycloalkanediones
作者:Dee W. Brooks、Hormoz Mazdiyasni、Paul G. Grothaus
DOI:10.1021/jo00391a009
日期:1987.7
Chiral building blocks for fused cyclopentanoids: enantioselective synthesis of 5-methylbicyclo[3.3.0]oct-1-ene-3,6-dione and derivatives