Synthesis of Enantioenriched α-Chiral Bicyclo[1.1.1]pentanes
作者:Marie L. J. Wong、James J. Mousseau、Steven J. Mansfield、Edward A. Anderson
DOI:10.1021/acs.orglett.9b00691
日期:2019.4.5
Bicyclo[1.1.1]pentanes (BCPs), useful surrogates for para-substituted arenes, alkynes, and tert-butyl groups in medicinal chemistry, are challenging to prepare when featuring stereogenic centers adjacent to the BCP. We report the development of an efficient route to α-chiral BCPs, via highly diastereoselective asymmetric enolate functionalization. We also describe the application of this chemistry
Highly Enantioselective Borane Reduction of Prochiral Ketones Catalyzed by <i>C</i><sub>3</sub>-Symmetric Tripodal β-Hydroxy Amides
作者:Da-Ming Du、Tao Fang、Jiaxi Xu
DOI:10.1055/s-2006-941591
日期:2006.6
The asymmetricboranereduction of prochiral ketones with a series of easily constructed chiral C-3-symmetric tripodal tris(beta-hydroxyamide) ligands was investigated. The borane complex of chiral ligand 1,1',1"-(1,3,5-benzenetricarbonyl)-tris[(2S)-alpha,alpha-diphenl-2-pyrrolidinemethanol] (1h) was found to be an efficient catalyst in asymmetricboranereduction of prochiral ketones and excellent
The ?SuperQuat? (R)-4-phenyl-5,5-dimethyl oxazolidin-2-one as an effective chiral auxiliary for conjugate additions: Asymmetric synthesis of (?)-Aplysillamide B
作者:Stephen G. Davies、Hitesh J. Sanganee、Peter Szolcsanyi
DOI:10.1016/s0040-4020(98)01145-4
日期:1999.3
(R)-4-Phenyl-5,5-dimethyl-oxazolidin-2-one, readily available from d-phenylglycine, is shown to be an effective chiralauxiliary for stereoselective conjugate additions to attached α,β-unsaturated N-acyl moieties. Its utility is demonstrated by the asymmetric synthesis of the antifungal, antibacterial (−)-Aplysillamide B.
The tetranuclear zinc cluster Zn4(OCOCF3)6O catalyzes the direct conversion of esters, lactones, and carboxylic acids to oxazolines with remarkable chemoselectivity.
Enantioselective addition of ArTi(O<sup>i</sup>Pr)<sub>3</sub> to aldehydes catalyzed by a titanium complex of an N-sulfonylated amino alcohol
作者:Shih-Ju Chang、Shuangliu Zhou、Han-Mou Gau
DOI:10.1039/c4ra14173c
日期:——
additions of ArTi(OiPr)3 to aldehydescatalyzed by a titaniumcatalyst of N-sulfonylated aminoalcohols were reported, and results showed that the chiral N-sulfonylated aminoalcohol with two stereogenic centers could catalyze the asymmetric addition of ArTi(OiPr)3 to aldehydes to afford desired secondary alcohols in good yields with good to excellent enantioselectivities of up to 95% ee.
报道了N-磺酰化氨基醇的钛催化剂催化醛基上不对称地添加ArTi(O i Pr)3,结果表明具有两个立体中心的手性N-磺酰化氨基醇可以催化ArTi(O)的不对称加成。i Pr)3-醛,以高收率提供所需的仲醇,并具有高达95%ee的良好至优异的对映选择性。